{"id":3493,"date":"2026-10-14T11:22:23","date_gmt":"2026-10-14T02:22:23","guid":{"rendered":"https:\/\/qol-kk.com\/wp2\/?p=3493"},"modified":"2026-10-14T11:22:23","modified_gmt":"2026-10-14T02:22:23","slug":"20261003-plan048","status":"publish","type":"post","link":"https:\/\/qol-kk.com\/wp2\/blog\/2026\/10\/14\/20261003-plan048\/","title":{"rendered":"\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4ed5\u7d44\u307f\u3068\u8a2d\u8a08\u539f\u5247\uff1a\u5165\u9580"},"content":{"rendered":"<h2>\u6982\u8981<\/h2>\n<p>\u300cSELECT \u304c\u9045\u3044\u300d\u300c\u4ef6\u6570\u304c\u5897\u3048\u305f\u3089\u6025\u306b\u91cd\u304f\u306a\u3063\u305f\u300d\u2014\u2014\u3053\u3046\u3057\u305f\u60a9\u307f\u306e\u591a\u304f\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u8a08\u3067\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001RDB\uff08MySQL \/ PostgreSQL \u3092\u60f3\u5b9a\uff09\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u3069\u3046\u52d5\u304f\u306e\u304b\u3092\u3001B-Tree \u306e\u4ed5\u7d44\u307f\u304b\u3089\u8a2d\u8a08\u306e\u5224\u65ad\u8ef8\u307e\u3067\u5165\u9580\u8005\u5411\u3051\u306b\u6574\u7406\u3057\u307e\u3059\u3002\u516c\u958b\u60c5\u5831\u3068\u4e00\u822c\u7684\u306a\u6319\u52d5\u306b\u57fa\u3065\u3044\u305f\u5185\u5bb9\u3067\u3059\u3002<\/p>\n<h2>\u305d\u3082\u305d\u3082\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u306f<\/h2>\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u672c\u4f53\u3068\u306f\u5225\u306b\u6301\u3064\u300c\u691c\u7d22\u7528\u306e\u7d22\u5f15\u300d\u3067\u3059\u3002\u672c\u306e\u5dfb\u672b\u7d22\u5f15\u3068\u540c\u3058\u3067\u3001\u300c\u3053\u306e\u5024\u306f\u3069\u306e\u884c\u306b\u3042\u308b\u304b\u300d\u3068\u3044\u3046\u5bfe\u5fdc\u95a2\u4fc2\u3092\u3001\u691c\u7d22\u3057\u3084\u3059\u3044\u9806\u5e8f\u3067\u4fdd\u6301\u3057\u307e\u3059\u3002<\/p>\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u7121\u3044\u5834\u5408\u3001\u6761\u4ef6\u306b\u5408\u3046\u884c\u3092\u63a2\u3059\u306b\u306f\u30c6\u30fc\u30d6\u30eb\u3092\u5148\u982d\u304b\u3089\u5168\u90e8\u306a\u3081\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\uff08\u30d5\u30eb\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\uff09\u30021\u4e07\u4ef6\u306a\u3089\u4e00\u77ac\u3067\u3082\u30011000\u4e07\u4ef6\u306b\u306a\u308b\u3068\u81f4\u547d\u7684\u306b\u9045\u304f\u306a\u308a\u307e\u3059\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u3042\u308c\u3070\u3001\u7d22\u5f15\u3092\u305f\u3069\u3063\u3066\u76ee\u7684\u306e\u884c\u3078\u6700\u77ed\u3067\u5230\u9054\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>B-Tree \u306e\u4ed5\u7d44\u307f<\/h2>\n<p>\u591a\u304f\u306eRDB\u306e\u6a19\u6e96\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f <strong>B-Tree<\/strong>\uff08\u6b63\u78ba\u306b\u306f B+Tree\uff09\u3067\u3059\u3002\u6b21\u306e\u6027\u8cea\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30c7\u30fc\u30bf\u304c<strong>\u30bd\u30fc\u30c8\u3055\u308c\u305f\u72b6\u614b<\/strong>\u3067\u30c4\u30ea\u30fc\u72b6\u306b\u4fdd\u6301\u3055\u308c\u308b<\/li>\n<li>\u30eb\u30fc\u30c8\u304b\u3089\u8449\u3078\u6570\u30db\u30c3\u30d7\u3067\u76ee\u7684\u306e\u5024\u306b\u5230\u9054\u3059\u308b\uff08\u8a08\u7b97\u91cf\u306f O(log n)\uff09<\/li>\n<li>\u8449\u30ce\u30fc\u30c9\u304c\u6a2a\u306b\u9023\u7d50\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001<strong>\u7bc4\u56f2\u691c\u7d22<\/strong>\u3084\u30bd\u30fc\u30c8\u6e08\u307f\u53d6\u5f97\u306b\u5f37\u3044<\/li>\n<\/ul>\n<pre class=\"lang:default decode:true\">            [ 50 ]                 \u2190 \u30eb\u30fc\u30c8\n           \/      \\\n      [20 35]    [70 90]           \u2190 \u4e2d\u9593\u30ce\u30fc\u30c9\n      \/  |  \\    \/  |  \\\n   \u8449: 10\u219215\u219220\u2192...\u219295  (\u6a2a\u306b\u9023\u7d50 = \u7bc4\u56f2\u30b9\u30ad\u30e3\u30f3\u304c\u901f\u3044)<\/pre>\n<p>100\u4e07\u4ef6\u3067\u3082\u30c4\u30ea\u30fc\u306e\u6df1\u3055\u306f\u6570\u6bb5\u3067\u6e08\u3080\u305f\u3081\u3001\u5168\u4ef6\u306a\u3081\u308b\u306e\u306b\u6bd4\u3079\u3066\u5727\u5012\u7684\u306b\u5c11\u306a\u3044\u30a2\u30af\u30bb\u30b9\u3067\u76ee\u7684\u306e\u884c\u306b\u5c4a\u304d\u307e\u3059\u3002<\/p>\n<h3>B-Tree \u304c\u52b9\u304f\u6761\u4ef6\u30fb\u52b9\u304b\u306a\u3044\u6761\u4ef6<\/h3>\n<p>\u5f37\u3044\u306e\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u7b49\u4fa1\u691c\u7d22\uff1a<code>WHERE user_id = 100<\/code><\/li>\n<li>\u7bc4\u56f2\u691c\u7d22\uff1a<code>WHERE created_at &gt;= '2026-01-01'<\/code><\/li>\n<li>\u524d\u65b9\u4e00\u81f4\uff1a<code>WHERE name LIKE 'tanaka%'<\/code><\/li>\n<li>\u30bd\u30fc\u30c8\uff1a<code>ORDER BY created_at<\/code><\/li>\n<\/ul>\n<p>\u9006\u306b\u4ee5\u4e0b\u306f\u52b9\u304d\u307e\u305b\u3093\u3002<\/p>\n<ul>\n<li>\u5f8c\u65b9\u4e00\u81f4\u30fb\u4e2d\u9593\u4e00\u81f4\uff1a<code>LIKE '%keyword%'<\/code><\/li>\n<li>\u5217\u3092\u52a0\u5de5\u3057\u305f\u6761\u4ef6\uff1a<code>WHERE YEAR(created_at) = 2026<\/code><\/li>\n<li>\u5426\u5b9a\u6761\u4ef6\uff1a<code>!=<\/code> \u3084 <code>NOT IN<\/code><\/li>\n<\/ul>\n<p><code>YEAR(created_at) = 2026<\/code> \u306f\u3001<code>created_at &gt;= '2026-01-01' AND created_at &lt; '2027-01-01'<\/code> \u3068\u7bc4\u56f2\u3067\u66f8\u304d\u63db\u3048\u308b\u3068\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<h2>\u539f\u56e0\u306e\u898b\u65b9\uff1a\u5b9f\u884c\u8a08\u753b<\/h2>\n<p>\u9045\u3044\u30af\u30a8\u30ea\u306f\u3001\u307e\u305a\u5b9f\u884c\u8a08\u753b\u3092\u898b\u3066\u300c\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u304b\u300d\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">-- MySQL\nEXPLAIN SELECT * FROM orders WHERE user_id = 100;\n\n-- PostgreSQL\uff08\u5b9f\u6e2c\u5024\u3064\u304d\uff09\nEXPLAIN ANALYZE SELECT * FROM orders WHERE user_id = 100;<\/pre>\n<p>MySQL \u306e <code>EXPLAIN<\/code> \u3067\u306f\u3001<code>type<\/code> \u304c <code>ALL<\/code>\uff08\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\uff09\u304b <code>ref<\/code> \/ <code>range<\/code>\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5229\u7528\uff09\u304b\u3001<code>key<\/code> \u306b\u3069\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u9078\u3070\u308c\u305f\u304b\u3001<code>rows<\/code> \u306b\u4f55\u884c\u8abf\u3079\u308b\u898b\u8fbc\u307f\u304b\u304c\u5206\u304b\u308a\u307e\u3059\u3002<code>ALL<\/code> \u304b\u3064 <code>rows<\/code> \u304c\u5de8\u5927\u306a\u3089\u8981\u5bfe\u7b56\u3067\u3059\u3002<\/p>\n<h2>\u8a2d\u8a08\u65b9\u91dd\uff1a\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u5217\u306e\u9806\u5e8f<\/h2>\n<p>\u8907\u6570\u5217\u3067\u7d5e\u308a\u8fbc\u3080\u5834\u5408\u30011\u5217\u305a\u3064\u500b\u5225\u306b\u5f35\u308b\u3088\u308a<strong>\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/strong>\u304c\u52b9\u304f\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002\u3053\u3053\u3067\u6700\u91cd\u8981\u306a\u306e\u304c<strong>\u5217\u306e\u9806\u5e8f<\/strong>\u3067\u3059\u3002<\/p>\n<p>\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u300c\u96fb\u8a71\u5e33\u300d\u3067\u8003\u3048\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u3002\u96fb\u8a71\u5e33\u306f\u300c\u59d3\u2192\u540d\u300d\u306e\u9806\u306b\u4e26\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u300c\u59d3\u304c\u4f50\u85e4\u300d\u3067\u5f15\u304f\uff1a\u901f\u3044<\/li>\n<li>\u300c\u59d3\u304c\u4f50\u85e4 \u304b\u3064 \u540d\u304c\u592a\u90ce\u300d\u3067\u5f15\u304f\uff1a\u901f\u3044<\/li>\n<li>\u300c\u540d\u304c\u592a\u90ce\u300d\u3060\u3051\u3067\u5f15\u304f\uff1a\u9045\u3044\uff08\u5148\u982d\u306e\u59d3\u304c\u6c7a\u307e\u3089\u306a\u3044\uff09<\/li>\n<\/ul>\n<p>\u3053\u308c\u304c <strong>\u5de6\u7aef\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\uff08leftmost prefix\uff09\u30eb\u30fc\u30eb<\/strong>\u3067\u3059\u3002\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 <code>(A, B, C)<\/code> \u306f\u3001<code>A<\/code>\u3001<code>A+B<\/code>\u3001<code>A+B+C<\/code> \u306e\u6761\u4ef6\u306b\u306f\u52b9\u304d\u307e\u3059\u304c\u3001<code>B<\/code> \u5358\u72ec\u3084 <code>C<\/code> \u5358\u72ec\u306b\u306f\u52b9\u304d\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"lang:default decode:true\">CREATE INDEX idx_orders_user_created ON orders (user_id, created_at);\n\n-- \u52b9\u304f\uff1a\u5148\u982d\u5217 user_id \u304b\u3089\u4f7f\u3048\u308b\nSELECT * FROM orders\n WHERE user_id = 100 AND created_at &gt;= '2026-01-01';\n\n-- \u52b9\u304d\u306b\u304f\u3044\uff1a\u5148\u982d\u306e user_id \u304c\u6761\u4ef6\u306b\u7121\u3044\nSELECT * FROM orders WHERE created_at &gt;= '2026-01-01';<\/pre>\n<p>\u5217\u9806\u306e\u539f\u5247\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li><strong>\u7b49\u4fa1\u6761\u4ef6\uff08<code>=<\/code>\uff09\u3092\u5148\u306b\u3001\u7bc4\u56f2\u6761\u4ef6\uff08<code>&gt;<\/code> <code>&lt;<\/code> <code>BETWEEN<\/code>\uff09\u3092\u5f8c\u306b<\/strong>\u7f6e\u304f<\/li>\n<li>\u7bc4\u56f2\u6761\u4ef6\u306e\u5217\u3088\u308a\u5f8c\u308d\u306e\u5217\u306f\u3001\u30bd\u30fc\u30c8\u30fb\u7d5e\u308a\u8fbc\u307f\u306b\u52b9\u304d\u306b\u304f\u3044<\/li>\n<li>\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\uff08\u5024\u306e\u7a2e\u985e\u306e\u591a\u3055\uff09\u304c\u9ad8\u304f\u3001\u3088\u304f\u4f7f\u3046\u6761\u4ef6\u3092\u512a\u5148\u3059\u308b<\/li>\n<\/ol>\n<h2>\u5b9f\u88c5\u4f8b\uff1a\u30bd\u30fc\u30c8\u5bfe\u5fdc\u3068\u30ab\u30d0\u30ea\u30f3\u30b0\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/h2>\n<h3>\u30bd\u30fc\u30c8\u307e\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u4efb\u305b\u308b<\/h3>\n<pre class=\"lang:default decode:true\">CREATE INDEX idx_posts_user_created ON posts (user_id, created_at);\n\n-- \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u65e2\u306b\u305d\u306e\u9806\u5e8f\u3067\u4e26\u3093\u3067\u3044\u308b\u306e\u3067\u30bd\u30fc\u30c8\u4e0d\u8981\nSELECT id, title, created_at\n  FROM posts\n WHERE user_id = 100\n ORDER BY created_at DESC\n LIMIT 20;<\/pre>\n<h3>\u30ab\u30d0\u30ea\u30f3\u30b0\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/h3>\n<p>\u30af\u30a8\u30ea\u304c\u5fc5\u8981\u3068\u3059\u308b\u5217\u304c<strong>\u3059\u3079\u3066\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u542b\u307e\u308c\u3066\u3044\u308b<\/strong>\u3068\u3001\u30c6\u30fc\u30d6\u30eb\u672c\u4f53\u3092\u898b\u306b\u884c\u304b\u305a\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3060\u3051\u3067\u7d50\u679c\u3092\u8fd4\u305b\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">CREATE INDEX idx_posts_cover ON posts (user_id, created_at, title);\n\nSELECT title, created_at\n  FROM posts\n WHERE user_id = 100\n ORDER BY created_at DESC;<\/pre>\n<p>MySQL \u306e <code>EXPLAIN<\/code> \u3067 <code>Extra<\/code> \u306b <code>Using index<\/code> \u3068\u51fa\u308c\u3070\u30ab\u30d0\u30ea\u30f3\u30b0\u304c\u52b9\u3044\u3066\u3044\u307e\u3059\u3002\u542b\u3081\u308b\u5217\u3092\u5897\u3084\u3059\u307b\u3069\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u592a\u308b\u306e\u3067\u3001\u4f7f\u3044\u3069\u3053\u308d\u306f\u7d5e\u308a\u307e\u3059\u3002<\/p>\n<h2>\u78ba\u8a8d\u65b9\u6cd5<\/h2>\n<ul>\n<li><code>EXPLAIN<\/code> \/ <code>EXPLAIN ANALYZE<\/code> \u3067 <code>type<\/code> \/ <code>key<\/code> \/ <code>rows<\/code> \/ <code>Extra<\/code> \u3092\u78ba\u8a8d\u3059\u308b<\/li>\n<li>\u60f3\u5b9a\u3057\u305f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c <code>key<\/code> \u306b\u9078\u3070\u308c\u3066\u3044\u308b\u304b<\/li>\n<li><code>Using filesort<\/code> \/ <code>Using temporary<\/code> \u304c\u51fa\u3066\u3044\u306a\u3044\u304b<\/li>\n<li>\u672c\u756a\u76f8\u5f53\u306e\u30c7\u30fc\u30bf\u91cf\u3067\u691c\u8a3c\u3059\u308b\uff08\u5c11\u91cf\u30c7\u30fc\u30bf\u3060\u3068\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u4f7f\u308f\u308c\u305a\u5224\u65ad\u3092\u8aa4\u308b\uff09<\/li>\n<\/ul>\n<h2>\u6ce8\u610f\u70b9\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u30b3\u30b9\u30c8\uff09<\/h2>\n<ul>\n<li><strong>\u66f8\u304d\u8fbc\u307f\u304c\u9045\u304f\u306a\u308b<\/strong>\uff1aINSERT \/ UPDATE \/ DELETE \u306e\u305f\u3073\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3082\u66f4\u65b0\u3055\u308c\u308b<\/li>\n<li><strong>\u30c7\u30a3\u30b9\u30af\u3092\u6d88\u8cbb\u3059\u308b<\/strong>\uff1a\u5b9f\u30c7\u30fc\u30bf\u3068\u306f\u5225\u306b\u5bb9\u91cf\u3092\u4f7f\u3046<\/li>\n<li><strong>\u4f7f\u308f\u308c\u306a\u3044\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u7d14\u7c8b\u306a\u8ca0\u50b5<\/strong>\uff1a\u66f4\u65b0\u30b3\u30b9\u30c8\u3060\u3051\u6255\u3046<\/li>\n<li><strong>\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u304c\u4f4e\u3044\u5217\u306f\u52b9\u304d\u306b\u304f\u3044<\/strong>\uff1a\u5024\u304c\u6570\u7a2e\u985e\u3057\u304b\u306a\u3044\u5217\u306f\u7d5e\u308a\u8fbc\u307f\u52b9\u679c\u304c\u8584\u3044<\/li>\n<li><strong>\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u304c\u9078\u3070\u306a\u3044\u3053\u3068\u3082\u3042\u308b<\/strong>\uff1a\u5bfe\u8c61\u884c\u304c\u5168\u4f53\u306e\u5927\u304d\u306a\u5272\u5408\u3060\u3068\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u304c\u9078\u3070\u308c\u308b<\/li>\n<\/ul>\n<p>\u539f\u5247\u306f\u300c<strong>\u3088\u304f\u5b9f\u884c\u3055\u308c\u3001\u304b\u3064\u9045\u3044\u30af\u30a8\u30ea<\/strong>\u304b\u3089\u9006\u7b97\u3057\u3066\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8a2d\u8a08\u3059\u308b\u300d\u3053\u3068\u3002\u5148\u56de\u308a\u3067\u4f55\u3067\u3082\u5f35\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u5b9f\u884c\u8a08\u753b\u3067\u88cf\u3092\u53d6\u308a\u306a\u304c\u3089\u5fc5\u8981\u306a\u3082\u306e\u3092\u8db3\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<ul>\n<li>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4e3b\u5f79\u306f B-Tree\u3002\u7b49\u4fa1\u30fb\u7bc4\u56f2\u30fb\u524d\u65b9\u4e00\u81f4\u30fb\u30bd\u30fc\u30c8\u306b\u5f37\u3044<\/li>\n<li>\u95a2\u6570\u52a0\u5de5\u30fb\u4e2d\u9593\u4e00\u81f4\u30fb\u5426\u5b9a\u6761\u4ef6\u3067\u306f\u52b9\u304b\u306a\u3044<\/li>\n<li>\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f<strong>\u5217\u306e\u9806\u5e8f\u304c\u547d<\/strong>\u3002\u7b49\u4fa1\u2192\u7bc4\u56f2\u3001\u5de6\u7aef\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3092\u610f\u8b58\u3059\u308b<\/li>\n<li><code>ORDER BY<\/code> \u3084\u30ab\u30d0\u30ea\u30f3\u30b0\u307e\u3067\u542b\u3081\u308b\u3068\u3001\u30bd\u30fc\u30c8\u3084\u30c6\u30fc\u30d6\u30eb\u30a2\u30af\u30bb\u30b9\u3092\u7701\u3051\u308b<\/li>\n<li>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u66f8\u304d\u8fbc\u307f\u30fb\u5bb9\u91cf\u306e\u30b3\u30b9\u30c8\u3092\u4f34\u3046\u8ca0\u50b5\u3067\u3082\u3042\u308b\u3002\u9045\u3044\u30af\u30a8\u30ea\u304b\u3089\u9006\u7b97\u3057\u3001<code>EXPLAIN<\/code> \u3067\u88cf\u3092\u53d6\u308b<\/li>\n<\/ul>\n<p>\u307e\u305a\u81ea\u5206\u306e\u30a2\u30d7\u30ea\u3067\u4e00\u756a\u9045\u3044\u30af\u30a8\u30ea\u306b <code>EXPLAIN<\/code> \u3092\u6253\u3064\u3068\u3053\u308d\u304b\u3089\u59cb\u3081\u308b\u3068\u3001\u8a2d\u8a08\u306e\u52d8\u6240\u304c\u3064\u304b\u3081\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u300cSELECT \u304c\u9045\u3044\u300d\u300c\u4ef6\u6570\u304c\u5897\u3048\u305f\u3089\u6025\u306b\u91cd\u304f\u306a\u3063\u305f\u300d\u2014\u2014\u3053\u3046\u3057\u305f\u60a9\u307f\u306e\u591a\u304f\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u8a08\u3067\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001RDB\uff08MySQL \/ PostgreSQL \u3092\u60f3\u5b9a\uff09\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u3069\u3046\u52d5\u304f\u306e\u304b\u3092\u3001B-Tree \u306e\u4ed5\u7d44\u307f\u304b\u3089\u8a2d\u8a08\u2026<\/p>\n","protected":false},"author":1,"featured_media":3492,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"sns_share_botton_hide":"","vkExUnit_sns_title":"","_vk_print_noindex":"","sitemap_hide":"","_veu_custom_css":"","veu_display_promotion_alert":"","vkexunit_cta_each_option":"","_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[35],"tags":[99,1183,424,562,1162,1086,472],"class_list":["post-3493","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql-memorandum","tag-mysql","tag-rdb","tag-424","tag-562","tag-1162","tag-1086","tag-472"],"veu_head_title_object":{"title":"","add_site_title":""},"jetpack_publicize_connections":[],"jetpack-related-posts":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/qol-kk.com\/wp2\/wp-content\/uploads\/2026\/10\/20261003-plan048-thumbnail.jpg","_links":{"self":[{"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/posts\/3493","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/comments?post=3493"}],"version-history":[{"count":1,"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/posts\/3493\/revisions"}],"predecessor-version":[{"id":3531,"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/posts\/3493\/revisions\/3531"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/media\/3492"}],"wp:attachment":[{"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/media?parent=3493"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/categories?post=3493"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qol-kk.com\/wp2\/wp-json\/wp\/v2\/tags?post=3493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}