{"id":2629,"date":"2025-03-24T08:46:54","date_gmt":"2025-03-23T23:46:54","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=2629"},"modified":"2025-03-24T08:47:22","modified_gmt":"2025-03-23T23:47:22","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91laravel-join%e3%81%ae%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89-%e5%ae%9f%e5%8b%99%e3%81%a7%e4%bd%bf%e3%81%88%e3%82%8b7%e3%81%a4%e3%81%ae%e5%ae%9f","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=2629","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011Laravel join\u306e\u5b8c\u5168\u30ac\u30a4\u30c9 &#8211; \u5b9f\u52d9\u3067\u4f7f\u3048\u308b7\u3064\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3068\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">Laravel\u3067join\u3092\u4f7f\u3046\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">Eloquent\u3067join\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8<\/a>      <\/li>      <li>        <a href=\"#i-2\">join\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u3068\u4f7f\u3044\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-3\">Laravel\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308bDB\u7d50\u5408\u306e\u7a2e\u985e<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-4\">\u5b9f\u52d9\u3067\u4f7f\u3048\u308b7\u3064\u306ejoin\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-5\">\u30b7\u30f3\u30d7\u30eb\u306a1\u5bfe\u591a\u306e\u30c6\u30fc\u30d6\u30eb\u7d50\u5408<\/a>      <\/li>      <li>        <a href=\"#i-6\">\u8907\u6570\u30c6\u30fc\u30d6\u30eb\u306e\u9023\u7d50\u7d50\u5408<\/a>      <\/li>      <li>        <a href=\"#i-7\">\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u7d50\u5408<\/a>      <\/li>      <li>        <a href=\"#i-8\">LEFT JOIN\u3067\u6b20\u640d\u30c7\u30fc\u30bf\u3092\u542b\u3080\u7d50\u5408<\/a>      <\/li>      <li>        <a href=\"#i-9\">\u6761\u4ef6\u4ed8\u304djoin\u306b\u3088\u308b\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/a>      <\/li>      <li>        <a href=\"#i-10\">\u96c6\u8a08\u95a2\u6570\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u7d50\u5408<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">polymorphic relationships\u3067\u306ejoin\u6d3b\u7528<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">join\u30af\u30a8\u30ea\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">\u5b9f\u884c\u8a08\u753b\u306e\u78ba\u8a8d\u3068\u5206\u6790\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-14\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3057\u305f\u7d50\u5408\u306e\u9ad8\u901f\u5316<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">N+1\u554f\u984c\u306e\u56de\u907f\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-16\">join\u306e\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u691c\u7d22\u6a5f\u80fd\u3067\u306e\u6d3b\u7528\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-18\">\u30ec\u30dd\u30fc\u30c8\u6a5f\u80fd\u3067\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-20\">\u3088\u304f\u3042\u308bjoin\u6d3b\u7528\u6642\u306e\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-21\">\u30af\u30a8\u30ea\u30d3\u30eb\u30c0\u3067\u306e\u30c7\u30d0\u30c3\u30b0\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-22\">\u30ab\u30e9\u30e0\u540d\u306e\u885d\u7a81\u3092\u9632\u3050\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-23\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">Laravel\u3067join\u3092\u4f7f\u3046\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">Eloquent\u3067join\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8<\/h3>\n\n\n\n<p>Eloquent\u3067join\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5927\u304d\u306a\u30e1\u30ea\u30c3\u30c8\u304c\u5f97\u3089\u308c\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30af\u30a8\u30ea\u306e\u53ef\u8aad\u6027\u5411\u4e0a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u5b9a\u7fa9\u3092\u6d3b\u7528\u3057\u305f\u76f4\u611f\u7684\u306a\u8a18\u8ff0\u304c\u53ef\u80fd<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u306e\u4fdd\u5b88\u6027\u304c\u9ad8\u307e\u308b<\/li>\n\n\n\n<li>\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u7406\u89e3\u304c\u3057\u3084\u3059\u3044<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u306e\u307f\u3092\u52b9\u7387\u7684\u306b\u53d6\u5f97<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u524a\u6e1b<\/li>\n\n\n\n<li>\u5b9f\u884c\u901f\u5ea6\u306e\u5411\u4e0a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u78ba\u4fdd<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u30b7\u30c3\u30d7\u306e\u5236\u7d04\u3092\u6d3b\u7528<\/li>\n\n\n\n<li>\u578b\u5b89\u5168\u6027\u306e\u78ba\u4fdd<\/li>\n\n\n\n<li>N+1\u554f\u984c\u306e\u56de\u907f<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">join\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u3068\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u57fa\u672c\u7684\u306ajoin\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u5f62\u5f0f\u3067\u8a18\u8ff0\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u57fa\u672c\u7684\u306ainner join\n$users = DB::table('users')\n    -&gt;join('orders', 'users.id', '=', 'orders.user_id')\n    -&gt;select('users.*', 'orders.total')\n    -&gt;get();\n\n\/\/ Eloquent\u30e2\u30c7\u30eb\u3067\u306e\u8a18\u8ff0\u4f8b\n$users = User::join('orders', 'users.id', '=', 'orders.user_id')\n    -&gt;select('users.*', 'orders.total')\n    -&gt;get();\n\n\/\/ where\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u4f8b\n$activeUsers = User::join('orders', 'users.id', '=', 'orders.user_id')\n    -&gt;where('orders.status', 'completed')\n    -&gt;select('users.*', 'orders.total')\n    -&gt;get();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">Laravel\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308bDB\u7d50\u5408\u306e\u7a2e\u985e<\/h3>\n\n\n\n<p>Laravel\u3067\u306f\u4ee5\u4e0b\u306e\u7d50\u5408\u30bf\u30a4\u30d7\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>INNER JOIN<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u4e21\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u4e00\u81f4\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u306e\u307f\u3092\u53d6\u5f97\n   $query-&gt;join('orders', 'users.id', '=', 'orders.user_id');<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>LEFT JOIN<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u5de6\u30c6\u30fc\u30d6\u30eb\u306e\u5168\u30ec\u30b3\u30fc\u30c9\u3068\u3001\u53f3\u30c6\u30fc\u30d6\u30eb\u306e\u4e00\u81f4\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\n   $query-&gt;leftJoin('orders', 'users.id', '=', 'orders.user_id');<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>RIGHT JOIN<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u53f3\u30c6\u30fc\u30d6\u30eb\u306e\u5168\u30ec\u30b3\u30fc\u30c9\u3068\u3001\u5de6\u30c6\u30fc\u30d6\u30eb\u306e\u4e00\u81f4\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\n   $query-&gt;rightJoin('orders', 'users.id', '=', 'orders.user_id');<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>CROSS JOIN<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u4e21\u30c6\u30fc\u30d6\u30eb\u306e\u5168\u30ec\u30b3\u30fc\u30c9\u306e\u7d44\u307f\u5408\u308f\u305b\u3092\u53d6\u5f97\n   $query-&gt;crossJoin('orders');<\/pre>\n\n\n\n<p>\u5404\u7d50\u5408\u30bf\u30a4\u30d7\u306e\u7279\u5fb4\uff1a<\/p>\n\n\n<div id=\"id-7f84544e-3bc2-4edf-9d03-9196648b2f62\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7d50\u5408\u30bf\u30a4\u30d7<\/th><th>\u7279\u5fb4<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><\/tr><\/thead><tbody><tr><td>INNER JOIN<\/td><td>\u4e00\u81f4\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u306e\u307f\u53d6\u5f97<\/td><td>\u5fc5\u9808\u306e\u95a2\u9023\u30c7\u30fc\u30bf\u53d6\u5f97<\/td><\/tr><tr><td>LEFT JOIN<\/td><td>\u5de6\u30c6\u30fc\u30d6\u30eb\u306e\u3059\u3079\u3066\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u4fdd\u6301<\/td><td>\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u306a\u95a2\u9023\u30c7\u30fc\u30bf\u53d6\u5f97<\/td><\/tr><tr><td>RIGHT JOIN<\/td><td>\u53f3\u30c6\u30fc\u30d6\u30eb\u306e\u3059\u3079\u3066\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u4fdd\u6301<\/td><td>\u7279\u5b9a\u306e\u30b1\u30fc\u30b9\u3067\u306e\u9006\u65b9\u5411\u7d50\u5408<\/td><\/tr><tr><td>CROSS JOIN<\/td><td>\u3059\u3079\u3066\u306e\u7d44\u307f\u5408\u308f\u305b\u3092\u751f\u6210<\/td><td>\u5168\u30d1\u30bf\u30fc\u30f3\u751f\u6210\u304c\u5fc5\u8981\u306a\u5834\u5408<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u5b9f\u88c5\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30ab\u30e9\u30e0\u540d\u306e\u885d\u7a81\u3092\u907f\u3051\u308b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u660e\u793a\u7684\u306a\u30ab\u30e9\u30e0\u6307\u5b9a\n   -&gt;select('users.id as user_id', 'orders.id as order_id')<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u7d50\u5408\u6761\u4ef6\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3067\u304d\u308b\u7d50\u5408\u6761\u4ef6\n   -&gt;join('orders', function($join) {\n       $join-&gt;on('users.id', '=', 'orders.user_id')\n            -&gt;where('orders.status', 'active');\n   })<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u30c6\u30fc\u30d6\u30eb\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4f7f\u7528\u3057\u305f\u7d50\u5408\n   -&gt;join('orders as o', 'users.id', '=', 'o.user_id')<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u57fa\u672c\u3092\u62bc\u3055\u3048\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u8907\u96d1\u306a\u30af\u30a8\u30ea\u306e\u69cb\u7bc9\u3084\u6700\u9069\u5316\u306b\u3082\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-4\">\u5b9f\u52d9\u3067\u4f7f\u3048\u308b7\u3064\u306ejoin\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30b7\u30f3\u30d7\u30eb\u306a1\u5bfe\u591a\u306e\u30c6\u30fc\u30d6\u30eb\u7d50\u5408<\/h3>\n\n\n\n<p>\u6700\u3082\u4e00\u822c\u7684\u306a1\u5bfe\u591a\u306e\u95a2\u4fc2\u3092\u6271\u3046\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u3068\u6ce8\u6587\u306e\u95a2\u4fc2\u306a\u3069\u3067\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e2\u30c7\u30eb\u5b9a\u7fa9\nclass User extends Model\n{\n    public function orders()\n    {\n        return $this-&gt;hasMany(Order::class);\n    }\n}\n\n\/\/ \u30af\u30a8\u30ea\u30d3\u30eb\u30c0\u3067\u306e\u5b9f\u88c5\n$users = User::join('orders', 'users.id', '=', 'orders.user_id')\n    -&gt;select('users.*', 'orders.total as order_total', 'orders.created_at as order_date')\n    -&gt;where('orders.status', 'completed')\n    -&gt;get();\n\n\/\/ with\u3092\u4f7f\u7528\u3057\u305f\u4ee3\u66ff\u5b9f\u88c5\uff08N+1\u554f\u984c\u3092\u9632\u3050\uff09\n$users = User::with(['orders' =&gt; function($query) {\n    $query-&gt;where('status', 'completed');\n}])-&gt;get();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u8907\u6570\u30c6\u30fc\u30d6\u30eb\u306e\u9023\u7d50\u7d50\u5408<\/h3>\n\n\n\n<p>3\u3064\u4ee5\u4e0a\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u9023\u7d50\u3057\u3066\u7d50\u5408\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u3001\u6ce8\u6587\u3001\u5546\u54c1\u306e\u95a2\u4fc2\u306a\u3069\u3067\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u8907\u6570\u30c6\u30fc\u30d6\u30eb\u306e\u9023\u7d50\u7d50\u5408\n$orders = Order::join('users', 'orders.user_id', '=', 'users.id')\n    -&gt;join('products', 'orders.product_id', '=', 'products.id')\n    -&gt;join('categories', 'products.category_id', '=', 'categories.id')\n    -&gt;select(\n        'orders.*',\n        'users.name as customer_name',\n        'products.name as product_name',\n        'categories.name as category_name'\n    )\n    -&gt;get();\n\n\/\/ \u30af\u30a8\u30ea\u30d3\u30eb\u30c0\u3067\u306e\u30c6\u30fc\u30d6\u30eb\u30a8\u30a4\u30ea\u30a2\u30b9\u4f7f\u7528\u4f8b\n$orders = DB::table('orders as o')\n    -&gt;join('users as u', 'o.user_id', '=', 'u.id')\n    -&gt;join('products as p', 'o.product_id', '=', 'p.id')\n    -&gt;join('categories as c', 'p.category_id', '=', 'c.id')\n    -&gt;select(\n        'o.*',\n        'u.name as customer_name',\n        'p.name as product_name',\n        'c.name as category_name'\n    )\n    -&gt;get();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u7d50\u5408<\/h3>\n\n\n\n<p>\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u6d3b\u7528\u3057\u3066\u8907\u96d1\u306a\u6761\u4ef6\u3067\u306e\u7d50\u5408\u3092\u5b9f\u73fe\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30b5\u30d6\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u7d50\u5408\u4f8b\n$users = DB::table('users')\n    -&gt;joinSub(\n        DB::table('orders')\n            -&gt;select('user_id')\n            -&gt;selectRaw('SUM(total) as total_orders')\n            -&gt;where('status', 'completed')\n            -&gt;groupBy('user_id'),\n        'order_totals',\n        'users.id',\n        '=',\n        'order_totals.user_id'\n    )\n    -&gt;select('users.*', 'order_totals.total_orders')\n    -&gt;get();\n\n\/\/ \u6761\u4ef6\u4ed8\u304d\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u4f8b\n$activeUsers = User::joinSub(\n    Order::select('user_id')\n        -&gt;whereMonth('created_at', now()-&gt;month)\n        -&gt;groupBy('user_id')\n        -&gt;havingRaw('COUNT(*) &gt; ?', [5]),\n    'active_users',\n    'users.id',\n    '=',\n    'active_users.user_id'\n)-&gt;get();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">LEFT JOIN\u3067\u6b20\u640d\u30c7\u30fc\u30bf\u3092\u542b\u3080\u7d50\u5408<\/h3>\n\n\n\n<p>\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u306a\u30c7\u30fc\u30bf\u3092\u542b\u3081\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u4f7f\u7528\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ LEFT JOIN\u306e\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\n$users = User::leftJoin('profiles', 'users.id', '=', 'profiles.user_id')\n    -&gt;select('users.*', 'profiles.bio', 'profiles.avatar')\n    -&gt;get();\n\n\/\/ \u8907\u6570\u306eLEFT JOIN\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u4f8b\n$users = User::leftJoin('profiles', 'users.id', '=', 'profiles.user_id')\n    -&gt;leftJoin('settings', 'users.id', '=', 'settings.user_id')\n    -&gt;select(\n        'users.*',\n        'profiles.bio',\n        'profiles.avatar',\n        'settings.notification_preferences'\n    )\n    -&gt;get();\n\n\/\/ NULL\u30c1\u30a7\u30c3\u30af\u3092\u542b\u3080\u4f8b\n$usersWithoutProfile = User::leftJoin('profiles', 'users.id', '=', 'profiles.user_id')\n    -&gt;whereNull('profiles.user_id')\n    -&gt;select('users.*')\n    -&gt;get();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u6761\u4ef6\u4ed8\u304djoin\u306b\u3088\u308b\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/h3>\n\n\n\n<p>\u7d50\u5408\u6642\u306b\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u4ed8\u52a0\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30af\u30ed\u30fc\u30b8\u30e3\u3092\u4f7f\u7528\u3057\u305f\u6761\u4ef6\u4ed8\u304djoin\n$users = User::join('orders', function($join) {\n    $join-&gt;on('users.id', '=', 'orders.user_id')\n         -&gt;where('orders.status', '=', 'completed')\n         -&gt;where('orders.total', '&gt;', 10000);\n})-&gt;select('users.*', 'orders.total')\n  -&gt;distinct()\n  -&gt;get();\n\n\/\/ \u65e5\u4ed8\u7bc4\u56f2\u3092\u4f7f\u7528\u3057\u305f\u6761\u4ef6\u4ed8\u304djoin\n$recentOrders = Order::join('users', function($join) {\n    $join-&gt;on('orders.user_id', '=', 'users.id')\n         -&gt;whereBetween('orders.created_at', [\n             now()-&gt;subDays(30),\n             now()\n         ]);\n})-&gt;select('orders.*', 'users.name')\n  -&gt;get();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u96c6\u8a08\u95a2\u6570\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u7d50\u5408<\/h3>\n\n\n\n<p>\u96c6\u8a08\u3068\u7d50\u5408\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u7d71\u8a08\u60c5\u5831\u3092\u53d6\u5f97\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u96c6\u8a08\u3092\u542b\u3080join\u30af\u30a8\u30ea\n$userStats = User::leftJoin('orders', 'users.id', '=', 'orders.user_id')\n    -&gt;select(\n        'users.id',\n        'users.name',\n        DB::raw('COUNT(orders.id) as total_orders'),\n        DB::raw('SUM(orders.total) as total_spent'),\n        DB::raw('AVG(orders.total) as avg_order_value')\n    )\n    -&gt;groupBy('users.id', 'users.name')\n    -&gt;having('total_orders', '&gt;', 0)\n    -&gt;get();\n\n\/\/ \u671f\u9593\u3054\u3068\u306e\u96c6\u8a08\u3092\u542b\u3080join\n$monthlyStats = Order::join('users', 'orders.user_id', '=', 'users.id')\n    -&gt;select(\n        DB::raw('DATE_FORMAT(orders.created_at, \"%Y-%m\") as month'),\n        DB::raw('COUNT(DISTINCT users.id) as unique_customers'),\n        DB::raw('SUM(orders.total) as total_revenue')\n    )\n    -&gt;groupBy(DB::raw('DATE_FORMAT(orders.created_at, \"%Y-%m\")'))\n    -&gt;orderBy('month', 'desc')\n    -&gt;get();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">polymorphic relationships\u3067\u306ejoin\u6d3b\u7528<\/h3>\n\n\n\n<p>\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30c3\u30af\u95a2\u9023\u3092\u6301\u3064\u30c6\u30fc\u30d6\u30eb\u3067\u306e\u7d50\u5408\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e2\u30c7\u30eb\u5b9a\u7fa9\nclass Comment extends Model\n{\n    public function commentable()\n    {\n        return $this-&gt;morphTo();\n    }\n}\n\nclass Post extends Model\n{\n    public function comments()\n    {\n        return $this-&gt;morphMany(Comment::class, 'commentable');\n    }\n}\n\n\/\/ \u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30c3\u30af\u95a2\u9023\u3092\u4f7f\u7528\u3057\u305fjoin\u30af\u30a8\u30ea\n$comments = Comment::where('commentable_type', Post::class)\n    -&gt;join('posts', function($join) {\n        $join-&gt;on('comments.commentable_id', '=', 'posts.id')\n             -&gt;where('comments.commentable_type', '=', Post::class);\n    })\n    -&gt;select('comments.*', 'posts.title as post_title')\n    -&gt;get();\n\n\/\/ \u8907\u6570\u306e\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30c3\u30af\u95a2\u9023\u3092\u6271\u3046\u4f8b\n$activities = Activity::where(function($query) {\n    $query-&gt;where('trackable_type', Post::class)\n          -&gt;orWhere('trackable_type', Comment::class);\n})\n-&gt;leftJoin('posts', function($join) {\n    $join-&gt;on('activities.trackable_id', '=', 'posts.id')\n         -&gt;where('activities.trackable_type', '=', Post::class);\n})\n-&gt;leftJoin('comments', function($join) {\n    $join-&gt;on('activities.trackable_id', '=', 'comments.id')\n         -&gt;where('activities.trackable_type', '=', Comment::class);\n})\n-&gt;select(\n    'activities.*',\n    'posts.title as post_title',\n    'comments.body as comment_body'\n)\n-&gt;get();<\/pre>\n\n\n\n<p>\u5404\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u914d\u616e<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u306a\u30ab\u30e9\u30e0\u306e\u307f\u3092\u9078\u629e\u3059\u308b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8a2d\u5b9a\u3059\u308b<\/li>\n\n\n\n<li>\u5927\u91cf\u30c7\u30fc\u30bf\u306e\u5834\u5408\u306f\u30c1\u30e3\u30f3\u30af\u51e6\u7406\u3092\u691c\u8a0e\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u610f\u56f3\u304c\u660e\u78ba\u306b\u306a\u308b\u3088\u3046\u306b\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u6574\u7406\u3059\u308b<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u30af\u30a8\u30ea\u306f\u5c02\u7528\u306e\u30b9\u30b3\u30fc\u30d7\u3068\u3057\u3066\u5207\u308a\u51fa\u3059<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u547d\u540d\u898f\u5247\u306b\u5f93\u3046<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4fdd\u5b88\u6027\u306e\u78ba\u4fdd<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u518d\u5229\u7528\u53ef\u80fd\u306a\u30af\u30a8\u30ea\u30b9\u30b3\u30fc\u30d7\u3092\u4f5c\u6210\u3059\u308b<\/li>\n\n\n\n<li>\u30c6\u30fc\u30d6\u30eb\u69cb\u9020\u306e\u5909\u66f4\u306b\u5f37\u3044\u8a2d\u8a08\u3092\u5fc3\u304c\u3051\u308b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30c9\u30ad\u30e5\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u6b8b\u3059<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">join\u30af\u30a8\u30ea\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u5b9f\u884c\u8a08\u753b\u306e\u78ba\u8a8d\u3068\u5206\u6790\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30af\u30a8\u30ea\u306e\u5b9f\u884c\u8a08\u753b\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u3067\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3092\u7279\u5b9a\u3057\u3001\u6700\u9069\u5316\u306e\u30d2\u30f3\u30c8\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30af\u30a8\u30ea\u30ed\u30b0\u306e\u6709\u52b9\u5316\uff08\u958b\u767a\u74b0\u5883\u3067\u306e\u30c7\u30d0\u30c3\u30b0\u7528\uff09\nDB::enableQueryLog();\n\n\/\/ \u30af\u30a8\u30ea\u306e\u5b9f\u884c\n$users = User::join('orders', 'users.id', '=', 'orders.user_id')\n    -&gt;select('users.*', 'orders.total')\n    -&gt;get();\n\n\/\/ \u30af\u30a8\u30ea\u30ed\u30b0\u306e\u78ba\u8a8d\ndd(DB::getQueryLog());\n\n\/\/ EXPLAIN\u3092\u4f7f\u7528\u3057\u305f\u5b9f\u884c\u8a08\u753b\u306e\u78ba\u8a8d\n$query = User::join('orders', 'users.id', '=', 'orders.user_id')\n    -&gt;select('users.*', 'orders.total')\n    -&gt;toSql();\n\n$explain = DB::select('EXPLAIN ' . $query);<\/pre>\n\n\n\n<p>\u5b9f\u884c\u8a08\u753b\u306e\u4e3b\u8981\u306a\u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n<div id=\"id-aeb15aa4-3085-4924-962d-e7344114436e\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u78ba\u8a8d\u9805\u76ee<\/th><th>\u671b\u307e\u3057\u3044\u72b6\u614b<\/th><th>\u8981\u6ce8\u610f\u306a\u72b6\u614b<\/th><\/tr><\/thead><tbody><tr><td>\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3<\/td><td>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f7f\u7528<\/td><td>\u30d5\u30eb\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3<\/td><\/tr><tr><td>\u7d50\u5408\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0<\/td><td>\u30cd\u30b9\u30c6\u30c3\u30c9\u30eb\u30fc\u30d7\/\u30cf\u30c3\u30b7\u30e5<\/td><td>\u30c6\u30f3\u30dd\u30e9\u30ea\u30c6\u30fc\u30d6\u30eb\u4f5c\u6210<\/td><\/tr><tr><td>\u8d70\u67fb\u884c\u6570<\/td><td>\u5fc5\u8981\u6700\u5c0f\u9650<\/td><td>\u5168\u884c\u30b9\u30ad\u30e3\u30f3<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3057\u305f\u7d50\u5408\u306e\u9ad8\u901f\u5316<\/h3>\n\n\n\n<p>\u52b9\u7387\u7684\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u8a08\u3068\u6d3b\u7528\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u5b9a\nSchema::create('orders', function (Blueprint $table) {\n    $table-&gt;id();\n    $table-&gt;foreignId('user_id')-&gt;constrained()-&gt;index();\n    $table-&gt;decimal('total', 10, 2);\n    $table-&gt;string('status');\n    \/\/ \u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4f5c\u6210\n    $table-&gt;index(['status', 'created_at']);\n});\n\n\/\/ \u65e2\u5b58\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8ffd\u52a0\nSchema::table('orders', function (Blueprint $table) {\n    $table-&gt;index(['user_id', 'status']);\n});\n\n\/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3059\u308b\u30af\u30a8\u30ea\u306e\u4f8b\n$activeOrders = Order::join('users', 'orders.user_id', '=', 'users.id')\n    -&gt;where('orders.status', 'active')\n    -&gt;whereDate('orders.created_at', '&gt;', now()-&gt;subDays(30))\n    -&gt;select('orders.*', 'users.name')\n    -&gt;get();<\/pre>\n\n\n\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u8a08\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7d50\u5408\u30ad\u30fc\u3078\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4ed8\u4e0e<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5916\u90e8\u30ad\u30fc\u306b\u306f\u5fc5\u305a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u7d50\u5408\u6761\u4ef6\u306b\u3082\u9069\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>WHERE\u53e5\u3068JOIN\u306e\u4e21\u65b9\u3067\u4f7f\u7528\u3055\u308c\u308b\u5217\u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n\n\n\n<li>\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3092\u8003\u616e\u3057\u305f\u5217\u9806\u5e8f\u306e\u6c7a\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u904e\u5270\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u56de\u907f<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u66f4\u65b0\u6027\u80fd\u3068\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u8003\u616e<\/li>\n\n\n\n<li>\u4f7f\u7528\u983b\u5ea6\u306e\u4f4e\u3044\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u524a\u9664<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">N+1\u554f\u984c\u306e\u56de\u907f\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>N+1\u554f\u984c\u3092\u9632\u3050\u305f\u3081\u306e\u52b9\u679c\u7684\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ N+1\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u30b3\u30fc\u30c9\n$users = User::all();\nforeach ($users as $user) {\n    \/\/ \u5404\u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3057\u3066\u500b\u5225\u306e\u30af\u30a8\u30ea\u304c\u767a\u884c\u3055\u308c\u308b\n    $orders = $user-&gt;orders;\n}\n\n\/\/ Eager\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u306b\u3088\u308b\u89e3\u6c7a\n$users = User::with('orders')-&gt;get();\n\n\/\/ \u6761\u4ef6\u4ed8\u304dEager\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\n$users = User::with(['orders' =&gt; function($query) {\n    $query-&gt;where('status', 'completed')\n          -&gt;select('id', 'user_id', 'total');\n}])-&gt;get();\n\n\/\/ join\u3068select\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u52b9\u7387\u7684\u306a\u30af\u30a8\u30ea\n$users = User::select('users.*')\n    -&gt;withCount(['orders as orders_count' =&gt; function($query) {\n        $query-&gt;where('status', 'completed');\n    }])\n    -&gt;having('orders_count', '&gt;', 0)\n    -&gt;get();<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u305f\u3081\u306e\u8ffd\u52a0\u30c6\u30af\u30cb\u30c3\u30af\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30af\u30a8\u30ea\u306e\u30c1\u30e3\u30f3\u30af\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">User::chunk(1000, function($users) {\n    foreach ($users as $user) {\n        \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u51e6\u7406\n    }\n});<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30ab\u30fc\u30bd\u30eb\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">foreach (User::with('orders')-&gt;cursor() as $user) {\n    \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u51e6\u7406\n}<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30af\u30a8\u30ea\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u7528\u3057\u305f\u30af\u30a8\u30ea\n$users = Cache::remember('active_users', 3600, function() {\n    return User::join('orders', 'users.id', '=', 'orders.user_id')\n        -&gt;where('orders.status', 'active')\n        -&gt;select('users.*')\n        -&gt;distinct()\n        -&gt;get();\n});<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30af\u30a8\u30ea\u5b9f\u884c\u6642\u9593\u306e\u76e3\u8996<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   $start = microtime(true);\n   $result = User::with('orders')-&gt;get();\n   $executionTime = microtime(true) - $start;\n   Log::info(\"Query execution time: {$executionTime} seconds\");<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   $memoryBefore = memory_get_usage();\n   $result = User::with('orders')-&gt;get();\n   $memoryAfter = memory_get_usage();\n   $memoryUsed = ($memoryAfter - $memoryBefore) \/ 1024 \/ 1024;\n   Log::info(\"Memory used: {$memoryUsed} MB\");<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30af\u30a8\u30ea\u30ab\u30a6\u30f3\u30c8\u306e\u76e3\u8996<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   DB::enableQueryLog();\n   $result = User::with('orders')-&gt;get();\n   $queryCount = count(DB::getQueryLog());\n   Log::info(\"Number of queries executed: {$queryCount}\");<\/pre>\n\n\n\n<p>\u6700\u9069\u5316\u6642\u306e\u91cd\u8981\u306a\u8003\u616e\u4e8b\u9805\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5b9f\u884c\u74b0\u5883\u306e\u9055\u3044\u3078\u306e\u914d\u616e<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u958b\u767a\u74b0\u5883\u3068\u672c\u756a\u74b0\u5883\u3067\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u9055\u3044<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u91cf\u306e\u9055\u3044\u306b\u3088\u308b\u5f71\u97ff<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u306e\u691c\u8a0e<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u5b9f\u884c\u901f\u5ea6\u306e\u30d0\u30e9\u30f3\u30b9<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6709\u52b9\u671f\u9650\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6bb5\u968e\u7684\u306a\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306e\u512a\u5148\u9806\u4f4d\u4ed8\u3051<\/li>\n\n\n\n<li>\u52b9\u679c\u6e2c\u5b9a\u3068\u7d99\u7d9a\u7684\u306a\u6539\u5584<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">join\u306e\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u691c\u7d22\u6a5f\u80fd\u3067\u306e\u6d3b\u7528\u4f8b<\/h3>\n\n\n\n<p>\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u6a2a\u65ad\u3057\u305f\u9ad8\u5ea6\u306a\u691c\u7d22\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ProductController extends Controller\n{\n    public function search(Request $request)\n    {\n        $query = Product::query()\n            -&gt;join('categories', 'products.category_id', '=', 'categories.id')\n            -&gt;leftJoin('brands', 'products.brand_id', '=', 'brands.id')\n            -&gt;select(\n                'products.*',\n                'categories.name as category_name',\n                'brands.name as brand_name'\n            );\n\n        \/\/ \u30ad\u30fc\u30ef\u30fc\u30c9\u691c\u7d22\n        if ($request-&gt;has('keyword')) {\n            $keyword = $request-&gt;input('keyword');\n            $query-&gt;where(function($q) use ($keyword) {\n                $q-&gt;where('products.name', 'LIKE', \"%{$keyword}%\")\n                  -&gt;orWhere('products.description', 'LIKE', \"%{$keyword}%\")\n                  -&gt;orWhere('categories.name', 'LIKE', \"%{$keyword}%\")\n                  -&gt;orWhere('brands.name', 'LIKE', \"%{$keyword}%\");\n            });\n        }\n\n        \/\/ \u4fa1\u683c\u7bc4\u56f2\u30d5\u30a3\u30eb\u30bf\u30fc\n        if ($request-&gt;has('min_price')) {\n            $query-&gt;where('products.price', '&gt;=', $request-&gt;input('min_price'));\n        }\n        if ($request-&gt;has('max_price')) {\n            $query-&gt;where('products.price', '&lt;=', $request-&gt;input('max_price'));\n        }\n\n        \/\/ \u30ab\u30c6\u30b4\u30ea\u30fc\u30d5\u30a3\u30eb\u30bf\u30fc\n        if ($request-&gt;has('category_ids')) {\n            $query-&gt;whereIn('categories.id', $request-&gt;input('category_ids'));\n        }\n\n        \/\/ \u5728\u5eab\u72b6\u614b\u30d5\u30a3\u30eb\u30bf\u30fc\n        if ($request-&gt;has('in_stock')) {\n            $query-&gt;where('products.stock', '&gt;', 0);\n        }\n\n        \/\/ \u30bd\u30fc\u30c8\u51e6\u7406\n        $sortBy = $request-&gt;input('sort_by', 'created_at');\n        $sortOrder = $request-&gt;input('sort_order', 'desc');\n        $query-&gt;orderBy($sortBy, $sortOrder);\n\n        return $query-&gt;paginate(20);\n    }\n}<\/pre>\n\n\n\n<p>\u9ad8\u5ea6\u306a\u691c\u7d22\u6a5f\u80fd\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u691c\u7d22\u6761\u4ef6\u306e\u52d5\u7684\u69cb\u7bc9<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   class SearchService\n   {\n       public function applyFilters($query, array $filters)\n       {\n           foreach ($filters as $field =&gt; $value) {\n               if (method_exists($this, \"apply{$field}Filter\")) {\n                   $this-&gt;{\"apply{$field}Filter\"}($query, $value);\n               }\n           }\n           return $query;\n       }\n\n       protected function applyKeywordFilter($query, $keyword)\n       {\n           return $query-&gt;where(function($q) use ($keyword) {\n               $q-&gt;where('products.name', 'LIKE', \"%{$keyword}%\")\n                 -&gt;orWhere('products.description', 'LIKE', \"%{$keyword}%\");\n           });\n       }\n\n       \/\/ \u4ed6\u306e\u30d5\u30a3\u30eb\u30bf\u30fc\u30e1\u30bd\u30c3\u30c9...\n   }<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u691c\u7d22\u7d50\u679c\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u5bfe\u7b56<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   $cacheKey = 'search_' . md5(json_encode($request-&gt;all()));\n   $results = Cache::remember($cacheKey, 3600, function() use ($query) {\n       return $query-&gt;paginate(20);\n   });<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30ec\u30dd\u30fc\u30c8\u6a5f\u80fd\u3067\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u8907\u96d1\u306a\u96c6\u8a08\u3084\u30ec\u30dd\u30fc\u30c8\u751f\u6210\u3067\u306ejoin\u6d3b\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class SalesReportController extends Controller\n{\n    public function generateMonthlyReport(Request $request)\n    {\n        $report = Order::join('order_items', 'orders.id', '=', 'order_items.order_id')\n            -&gt;join('products', 'order_items.product_id', '=', 'products.id')\n            -&gt;join('categories', 'products.category_id', '=', 'categories.id')\n            -&gt;select(\n                DB::raw('DATE_FORMAT(orders.created_at, \"%Y-%m\") as month'),\n                'categories.name as category',\n                DB::raw('COUNT(DISTINCT orders.id) as total_orders'),\n                DB::raw('SUM(order_items.quantity) as total_items'),\n                DB::raw('SUM(order_items.quantity * order_items.price) as revenue')\n            )\n            -&gt;whereYear('orders.created_at', $request-&gt;input('year', date('Y')))\n            -&gt;groupBy('month', 'categories.name')\n            -&gt;orderBy('month')\n            -&gt;orderBy('revenue', 'desc')\n            -&gt;get();\n\n        return $this-&gt;formatReportData($report);\n    }\n\n    private function formatReportData($report)\n    {\n        \/\/ \u30ec\u30dd\u30fc\u30c8\u30c7\u30fc\u30bf\u306e\u6574\u5f62\u51e6\u7406\n        return $report-&gt;groupBy('month')\n            -&gt;map(function($monthData) {\n                return [\n                    'categories' =&gt; $monthData-&gt;pluck('revenue', 'category'),\n                    'totals' =&gt; [\n                        'orders' =&gt; $monthData-&gt;sum('total_orders'),\n                        'items' =&gt; $monthData-&gt;sum('total_items'),\n                        'revenue' =&gt; $monthData-&gt;sum('revenue')\n                    ]\n                ];\n            });\n    }\n}<\/pre>\n\n\n\n<p>\u30ec\u30dd\u30fc\u30c8\u6a5f\u80fd\u5b9f\u88c5\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   class ReportExportJob implements ShouldQueue\n   {\n       public function handle()\n       {\n           Order::with(['items.product.category'])\n               -&gt;chunk(1000, function($orders) {\n                   foreach ($orders as $order) {\n                       \/\/ \u30ec\u30dd\u30fc\u30c8\u30c7\u30fc\u30bf\u306e\u51e6\u7406\n                   }\n               });\n       }\n   }<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u96c6\u8a08\u51e6\u7406\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   \/\/ \u30b5\u30d6\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u96c6\u8a08\n   $topCategories = Category::select('categories.*')\n       -&gt;joinSub(\n           OrderItem::select('products.category_id')\n               -&gt;join('products', 'order_items.product_id', '=', 'products.id')\n               -&gt;selectRaw('SUM(quantity * price) as total_revenue')\n               -&gt;groupBy('products.category_id'),\n           'category_sales',\n           'categories.id',\n           '=',\n           'category_sales.category_id'\n       )\n       -&gt;orderByDesc('total_revenue')\n       -&gt;limit(10)\n       -&gt;get();<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   class LargeDataProcessor\n   {\n       public function process()\n       {\n           \/\/ \u30c1\u30e3\u30f3\u30af\u51e6\u7406\u3068\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u306e\u7d44\u307f\u5408\u308f\u305b\n           $generator = function() {\n               $query = Order::join('order_items', 'orders.id', '=', 'order_items.order_id')\n                   -&gt;select('orders.*', 'order_items.quantity', 'order_items.price');\n\n               foreach ($query-&gt;cursor() as $record) {\n                   yield $record;\n               }\n           };\n\n           foreach ($generator() as $record) {\n               \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u51e6\u7406\n           }\n       }\n   }<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   class DataProcessingJob implements ShouldQueue\n   {\n       public function handle()\n       {\n           $query = Order::join('order_items', 'orders.id', '=', 'order_items.order_id')\n               -&gt;select('orders.*', 'order_items.quantity', 'order_items.price');\n\n           $query-&gt;chunk(1000, function($records) {\n               foreach ($records as $record) {\n                   \/\/ \u30d0\u30c3\u30c1\u51e6\u7406\n                   $this-&gt;processRecord($record);\n               }\n           });\n       }\n\n       private function processRecord($record)\n       {\n           \/\/ \u30ec\u30b3\u30fc\u30c9\u5358\u4f4d\u306e\u51e6\u7406\n       }\n   }<\/pre>\n\n\n\n<p>\u51e6\u7406\u306e\u5b9f\u88c5\u306b\u304a\u3051\u308b\u91cd\u8981\u306a\u8003\u616e\u4e8b\u9805\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u78ba\u4fdd<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n\n\n\n<li>\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u306e\u56de\u907f<\/li>\n\n\n\n<li>\u4e00\u8cab\u6027\u306e\u3042\u308b\u96c6\u8a08\u7d50\u679c\u306e\u78ba\u4fdd<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f8b\u5916\u306e\u9069\u5207\u306a\u6355\u6349\u3068\u51e6\u7406<\/li>\n\n\n\n<li>\u30ed\u30b0\u306e\u8a18\u9332<\/li>\n\n\n\n<li>\u30ea\u30c8\u30e9\u30a4\u6a5f\u69cb\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6c34\u5e73\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0\u3078\u306e\u5bfe\u5fdc<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\u306e\u691c\u8a0e<\/li>\n\n\n\n<li>\u975e\u540c\u671f\u51e6\u7406\u306e\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-20\">\u3088\u304f\u3042\u308bjoin\u6d3b\u7528\u6642\u306e\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u30af\u30a8\u30ea\u30d3\u30eb\u30c0\u3067\u306e\u30c7\u30d0\u30c3\u30b0\u65b9\u6cd5<\/h3>\n\n\n\n<p>Laravel\u3067join\u30af\u30a8\u30ea\u3092\u30c7\u30d0\u30c3\u30b0\u3059\u308b\u52b9\u679c\u7684\u306a\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30af\u30a8\u30ea\u30ed\u30b0\u306e\u6709\u52b9\u5316\u3068\u30c7\u30d0\u30c3\u30b0\nclass QueryDebugger\n{\n    public static function enableQueryLog()\n    {\n        DB::enableQueryLog();\n    }\n\n    public static function dumpQuery($query)\n    {\n        \/\/ \u30af\u30a8\u30ea\u306e\u5b9f\u884c\u524d\u306b\u751f\u306eSQL\u3092\u78ba\u8a8d\n        $sql = $query-&gt;toSql();\n        $bindings = $query-&gt;getBindings();\n\n        \/\/ \u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u3092\u5b9f\u969b\u306e\u5024\u3067\u7f6e\u63db\n        foreach ($bindings as $binding) {\n            $value = is_numeric($binding) ? $binding : \"'\".$binding.\"'\";\n            $sql = preg_replace('\/\\?\/', $value, $sql, 1);\n        }\n\n        dump([\n            'raw_sql' =&gt; $sql,\n            'bindings' =&gt; $bindings,\n            'execution_time' =&gt; self::measureExecutionTime(function() use ($query) {\n                return $query-&gt;get();\n            })\n        ]);\n    }\n\n    private static function measureExecutionTime(callable $callback)\n    {\n        $start = microtime(true);\n        $result = $callback();\n        $end = microtime(true);\n\n        return [\n            'seconds' =&gt; $end - $start,\n            'result' =&gt; $result\n        ];\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\n$query = User::join('orders', 'users.id', '=', 'orders.user_id')\n    -&gt;where('orders.status', 'pending');\n\nQueryDebugger::enableQueryLog();\nQueryDebugger::dumpQuery($query);<\/pre>\n\n\n\n<p>\u30c7\u30d0\u30c3\u30b0\u6642\u306e\u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30af\u30a8\u30ea\u306e\u69cb\u6587\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c6\u30fc\u30d6\u30eb\u540d\u306e\u78ba\u8a8d<\/li>\n\n\n\n<li>\u30ab\u30e9\u30e0\u540d\u306e\u78ba\u8a8d<\/li>\n\n\n\n<li>\u7d50\u5408\u6761\u4ef6\u306e\u6b63\u78ba\u6027<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5b9f\u884c\u8a08\u753b\u306e\u78ba\u8a8d<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4f7f\u7528\u72b6\u6cc1<\/li>\n\n\n\n<li>\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\u306e\u6709\u7121<\/li>\n\n\n\n<li>\u4e00\u6642\u30c6\u30fc\u30d6\u30eb\u306e\u4f7f\u7528\u6709\u7121<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30e1\u30c8\u30ea\u30af\u30b9\u306e\u53ce\u96c6<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9f\u884c\u6642\u9593<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/li>\n\n\n\n<li>\u8fd4\u5374\u30ec\u30b3\u30fc\u30c9\u6570<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">\u30ab\u30e9\u30e0\u540d\u306e\u885d\u7a81\u3092\u9632\u3050\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class QueryBuilder\n{\n    public static function buildSafeJoinQuery()\n    {\n        \/\/ \u30c6\u30fc\u30d6\u30eb\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u4f7f\u7528\n        return Order::from('orders as o')\n            -&gt;join('users as u', 'o.user_id', '=', 'u.id')\n            -&gt;join('products as p', 'o.product_id', '=', 'p.id')\n            -&gt;select([\n                'o.id as order_id',\n                'o.created_at as order_date',\n                'u.id as user_id',\n                'u.name as user_name',\n                'p.id as product_id',\n                'p.name as product_name'\n            ]);\n    }\n\n    public static function buildComplexJoinQuery()\n    {\n        \/\/ \u30b5\u30d6\u30af\u30a8\u30ea\u3067\u306e\u30ab\u30e9\u30e0\u540d\u885d\u7a81\u56de\u907f\n        $userOrdersQuery = Order::select('user_id')\n            -&gt;selectRaw('COUNT(*) as order_count')\n            -&gt;groupBy('user_id');\n\n        return User::select([\n                'users.id',\n                'users.name',\n                'order_stats.order_count'\n            ])\n            -&gt;joinSub($userOrdersQuery, 'order_stats', function($join) {\n                $join-&gt;on('users.id', '=', 'order_stats.user_id');\n            });\n    }\n}<\/pre>\n\n\n\n<p>\u30ab\u30e9\u30e0\u540d\u885d\u7a81\u3092\u56de\u907f\u3059\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u660e\u793a\u7684\u306a\u30ab\u30e9\u30e0\u9078\u629e<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   $query = User::join('orders', 'users.id', '=', 'orders.user_id')\n       -&gt;select([\n           'users.id as user_id',\n           'users.email',\n           'orders.id as order_id',\n           'orders.total'\n       ]);<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30c6\u30fc\u30d6\u30eb\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   Schema::create('user_profiles', function (Blueprint $table) {\n       $table-&gt;id();\n       $table-&gt;foreignId('user_id')-&gt;constrained();\n       $table-&gt;string('user_address');\n       $table-&gt;string('user_phone');\n   });<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-23\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316\u65b9\u6cd5<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class MemoryOptimizer\n{\n    public static function processLargeJoinQuery()\n    {\n        \/\/ \u30c1\u30e3\u30f3\u30af\u51e6\u7406\u306b\u3088\u308b\u6700\u9069\u5316\n        Order::join('order_items', 'orders.id', '=', 'order_items.order_id')\n            -&gt;select('orders.*', 'order_items.quantity', 'order_items.price')\n            -&gt;chunk(1000, function($orders) {\n                foreach ($orders as $order) {\n                    \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u51e6\u7406\n                    static::processOrder($order);\n                }\n            });\n    }\n\n    public static function streamResults()\n    {\n        \/\/ \u30ab\u30fc\u30bd\u30eb\u3092\u4f7f\u7528\u3057\u305f\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\n        foreach (Order::join('users', 'orders.user_id', '=', 'users.id')\n                    -&gt;select('orders.*', 'users.name')\n                    -&gt;cursor() as $order) {\n            \/\/ 1\u30ec\u30b3\u30fc\u30c9\u305a\u3064\u51e6\u7406\n            static::processOrder($order);\n        }\n    }\n\n    public static function useGenerator()\n    {\n        \/\/ \u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u51e6\u7406\n        $generator = function() {\n            $query = Order::join('products', 'orders.product_id', '=', 'products.id')\n                -&gt;select('orders.*', 'products.name');\n\n            foreach ($query-&gt;cursor() as $record) {\n                yield $record;\n            }\n        };\n\n        foreach ($generator() as $record) {\n            \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u51e6\u7406\n            static::processRecord($record);\n        }\n    }\n}<\/pre>\n\n\n\n<p>\u30e1\u30e2\u30ea\u6700\u9069\u5316\u306e\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e0d\u8981\u306a\u30ab\u30e9\u30e0\u306e\u9664\u5916<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   $query = User::join('orders', 'users.id', '=', 'orders.user_id')\n       -&gt;select(['users.id', 'users.email', 'orders.total'])  \/\/ \u5fc5\u8981\u306a\u30ab\u30e9\u30e0\u306e\u307f\u9078\u629e\n       -&gt;whereYear('orders.created_at', date('Y'));<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30da\u30fc\u30b8\u30cd\u30fc\u30b7\u30e7\u30f3\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   $results = User::join('orders', 'users.id', '=', 'orders.user_id')\n       -&gt;select('users.*', 'orders.total')\n       -&gt;paginate(50);  \/\/ 50\u4ef6\u305a\u3064\u53d6\u5f97<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6226\u7565\u7684\u306a\u4f7f\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   $cacheKey = 'user_orders_' . $userId;\n   $results = Cache::remember($cacheKey, 3600, function() use ($userId) {\n       return User::join('orders', 'users.id', '=', 'orders.user_id')\n           -&gt;where('users.id', $userId)\n           -&gt;select('users.*', 'orders.total')\n           -&gt;get();\n   });<\/pre>\n\n\n\n<p>\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u554f\u984c<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u78ba\u8a8d<\/li>\n\n\n\n<li>\u5b9f\u884c\u8a08\u753b\u306e\u5206\u6790<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u6574\u5408\u6027<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7d50\u5408\u6761\u4ef6\u306e\u6b63\u78ba\u6027<\/li>\n\n\n\n<li>NULL\u5024\u306e\u51e6\u7406<\/li>\n\n\n\n<li>\u91cd\u8907\u30ec\u30b3\u30fc\u30c9\u306e\u51e6\u7406<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f8b\u5916\u51e6\u7406\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30ed\u30b0\u8a18\u9332\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u9069\u5207\u306a\u8868\u793a<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":{"0":"post-2629","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-php","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2629","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2629"}],"version-history":[{"count":2,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2629\/revisions"}],"predecessor-version":[{"id":2631,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/2629\/revisions\/2631"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2629"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2629"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2629"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}