{"id":1237,"date":"2025-02-02T16:36:22","date_gmt":"2025-02-02T07:36:22","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/route\/1237\/"},"modified":"2025-05-25T16:54:04","modified_gmt":"2025-05-25T07:54:04","slug":"1237","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/1237\/","title":{"rendered":"\u3010\u56f3\u89e3\u30fb\u5b9f\u8df5\u30b3\u30fc\u30c9\u4ed8\u304d\u3011MySQL\u306eROW_NUMBER()\u5b8c\u5168\u30ac\u30a4\u30c9\uff5c\u6700\u65b0\u30c7\u30fc\u30bf\u30921\u4ef6\u3060\u3051\u62bd\u51fa\u3059\u308bROW_NUMBER()\u306e\u4f7f\u3044\u65b9\u9806\u756a\u4ed8\u3051\u306e\u57fa\u672c\u3068\u5b9f\u52d9\u3067\u306e\u6d3b\u7528\u6cd5"},"content":{"rendered":"<div>\n<h2>\u306f\u3058\u3081\u306b\uff1a\u30c7\u30fc\u30bf\u306b\u300c\u9806\u756a\u300d\u3092\u3064\u3051\u305f\u3044\u3068\u304d\u3001\u3069\u3046\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/h2>\n<ul>\n<li>\n<p>\u300c\u6700\u65b0\u306e\u6295\u7a3f\u306b\u756a\u53f7\u3092\u632f\u308a\u305f\u3044\u300d<\/p>\n<\/li>\n<li>\n<p>\u300c\u540c\u3058\u30ab\u30c6\u30b4\u30ea\u3054\u3068\u306b1\u4f4d\u30fb2\u4f4d\u30fb3\u4f4d\u3068\u30e9\u30f3\u30ad\u30f3\u30b0\u3057\u305f\u3044\u300d<\/p>\n<\/li>\n<li>\n<p>\u300c\u8907\u6570\u6761\u4ef6\u3067\u6700\u521d\u306e\u30c7\u30fc\u30bf\u3060\u3051\u3092\u62bd\u51fa\u3057\u305f\u3044\u300d<\/p>\n<\/li>\n<\/ul>\n<p>\u3053\u3093\u306a\u8ab2\u984c\u3001\u3042\u306a\u305f\u3082\u611f\u3058\u305f\u3053\u3068\u3042\u308a\u307e\u305b\u3093\u304b\uff1f<\/p>\n<p>MySQL\u3067\u306f\u3001<strong>ROW_NUMBER()\u95a2\u6570<\/strong>\u3092\u4f7f\u3048\u3070\u3001\u30c7\u30fc\u30bf\u306b\u300c\u9806\u756a\uff08\u9023\u756a\uff09\u300d\u3092\u4ed8\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30c7\u30fc\u30bf\u5206\u6790\u30fb\u753b\u9762\u8868\u793a\u30fb\u696d\u52d9\u5e33\u7968\u306a\u3069\u3001\u3042\u3089\u3086\u308b\u5b9f\u52d9\u3067\u975e\u5e38\u306b\u5f79\u7acb\u3064\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001ROW_NUMBER()\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u3092<strong>\u308f\u304b\u308a\u3084\u3059\u304f\u3001\u304b\u3064\u5b9f\u52d9\u7684\u306b<\/strong>\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<hr>\n<h2>ROW_NUMBER()\u3068\u306f\uff1f\uff5cSQL\u30a6\u30a3\u30f3\u30c9\u30a6\u95a2\u6570\u306e\u57fa\u672c<\/h2>\n<h3>ROW_NUMBER()\u306e\u5f79\u5272<\/h3>\n<p>ROW_NUMBER()\u306f\u3001<strong>\u30c7\u30fc\u30bf\u306e\u4e26\u3073\u9806\u306b\u5fdc\u3058\u3066\u3001\u9023\u756a\uff081, 2, 3&#8230;\uff09\u3092\u4ed8\u3051\u308b\u30a6\u30a3\u30f3\u30c9\u30a6\u95a2\u6570<\/strong>\u3067\u3059\u3002<\/p>\n<pre><code>ROW_NUMBER() OVER (ORDER BY column_name)<\/code><\/pre>\n<ul>\n<li>\n<p>OVER\u53e5\u5185\u3067\u6307\u5b9a\u3057\u305f<strong>ORDER BY\u306e\u9806\u5e8f\u306b\u5f93\u3063\u3066<\/strong>\u756a\u53f7\u304c\u632f\u3089\u308c\u307e\u3059\u3002<\/p>\n<\/li>\n<li>\n<p>\u7d50\u679c\u306f\u30b5\u30d6\u30af\u30a8\u30ea\u3084CTE\uff08\u5171\u901a\u30c6\u30fc\u30d6\u30eb\u5f0f\uff09\u3068\u4e00\u7dd2\u306b\u4f7f\u3046\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<hr>\n<h3>\u25bc \u57fa\u672c\u69cb\u6587\u3068\u5b9f\u884c\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u30ed\u30b0\u30a4\u30f3\u5c65\u6b74\u306b\u9806\u756a\u3092\u4ed8\u3051\u308b\u4f8b\u3067\u3059\u3002<\/p>\n<pre><code>SELECT\r\n  user_id,\r\n  login_date,\r\n  ROW_NUMBER() OVER (ORDER BY login_date DESC) <span>AS<\/span> login_rank\r\nFROM user_logins;<\/code><\/pre>\n<pre><code>+---------+---------------------+-------------+\r\n<span>| user_id |<\/span> login_date          <span>| login_rank  |<\/span>\r\n+---------+---------------------+-------------+\r\n<span>| 101     |<\/span> <span>2024<\/span>-<span>12<\/span>-<span>15<\/span> <span>10<\/span><span>:<\/span><span>00<\/span><span>:<\/span><span>00<\/span> <span>| 1           |<\/span>\r\n<span>| 101     |<\/span> <span>2024<\/span>-<span>12<\/span>-<span>14<\/span> 08<span>:<\/span><span>30<\/span><span>:<\/span><span>00<\/span> <span>| 2           |<\/span>\r\n<span>| 102     |<\/span> <span>2024<\/span>-<span>12<\/span>-<span>13<\/span> 09<span>:<\/span><span>15<\/span><span>:<\/span><span>00<\/span> <span>| 3           |<\/span>\r\n+---------+---------------------+-------------+<\/code><\/pre>\n<p>\u2192 <strong>\u6700\u65b0\u306e\u30ed\u30b0\u30a4\u30f3\u304b\u3089\u9806\u306b1\u4f4d\u30fb2\u4f4d\u2026\u3068\u4e26\u3076<\/strong>\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<hr>\n<h2>\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306b\u9806\u4f4d\u3092\u3064\u3051\u308b\u306b\u306f\uff1f\uff5cPARTITION BY\u306e\u6d3b\u7528<\/h2>\n<h3>\u76ee\u7684\u5225\u306b\u9806\u4f4d\u3092\u3064\u3051\u308b<\/h3>\n<p>\u4f8b\u3048\u3070\u3001\u300c\u30e6\u30fc\u30b6\u30fc\u3054\u3068\u306e\u30ed\u30b0\u30a4\u30f3\u56de\u6570\u30921\u4f4d\u304b\u3089\u6570\u3048\u305f\u3044\u300d\u3068\u3044\u3046\u30b1\u30fc\u30b9\u3067\u306f\u3001<strong>PARTITION BY\u53e5<\/strong>\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre><code>SELECT\r\n  user_id,\r\n  login_date,\r\n  ROW_NUMBER() OVER (\r\n    PARTITION BY user_id\r\n    ORDER BY login_date DESC\r\n  ) <span>AS<\/span> user_rank\r\nFROM user_logins;<\/code><\/pre>\n<p>\u56f3\u89e3\u30c6\u30ad\u30b9\u30c8<\/p>\n<pre><code>\u3010<span>ROW_NUMBER<\/span>\u306e\u30a4\u30e1\u30fc\u30b8\u3011\r\n\r\n<span>[user_id\u3067\u30b0\u30eb\u30fc\u30d7\u5316]<\/span>\r\n\u3000\u3000\u2193\r\n<span>[login_date\u3067\u30bd\u30fc\u30c8]<\/span>\r\n\u3000\u3000\u2193\r\n<span>[\u5404\u30b0\u30eb\u30fc\u30d7\u5185\u30671\u301cN\u3092\u4ed8\u4e0e]<\/span><\/code><\/pre>\n<hr>\n<h2>\u30b5\u30d6\u30af\u30a8\u30ea\u3067\u300c\u6700\u65b01\u4ef6\u3060\u3051\u300d\u3092\u53d6\u308a\u51fa\u3059<\/h2>\n<p>ROW_NUMBER()\u3092<strong>\u30b5\u30d6\u30af\u30a8\u30ea\u3068\u7d44\u307f\u5408\u308f\u305b\u308b<\/strong>\u3068\u3001\u300c\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306b\u6700\u65b0\u306e1\u4ef6\u3060\u3051\u62bd\u51fa\u3059\u308b\u300d\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre><code>SELECT *\r\nFROM (\r\n  SELECT\r\n    user_id,\r\n    login_date,\r\n    ROW_NUMBER() OVER (\r\n      PARTITION BY user_id\r\n      ORDER BY login_date DESC\r\n    ) <span>AS<\/span> rn\r\n  FROM user_logins\r\n) <span>AS<\/span> ranked\r\nWHERE rn = <span>1<\/span>;<\/code><\/pre>\n<p>\u2192 \u30e6\u30fc\u30b6\u30fc\u3054\u3068\u306b\u6700\u65b0\u30ed\u30b0\u30a4\u30f31\u4ef6\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<\/p>\n<hr>\n<h2>\u3088\u304f\u3042\u308b\u3064\u307e\u305a\u304d\uff5cROW_NUMBER()\u306e\u843d\u3068\u3057\u7a74\u3068\u89e3\u6c7a\u6cd5<\/h2>\n<h3>\u00a0\u9593\u9055\u3063\u305f\u5b9f\u88c5\u4f8b\uff1aGROUP BY\u3068\u306e\u4f75\u7528\u3067\u610f\u56f3\u3057\u306a\u3044\u7d50\u679c\u306b<\/h3>\n<pre><code>SELECT\r\n  user_id,\r\n  MAX(login_date),\r\n  ROW_NUMBER() OVER (ORDER BY login_date DESC)\r\nFROM user_logins\r\nGROUP BY user_id;<\/code><\/pre>\n<ul>\n<li>\n<p>ROW_NUMBER()\u3068GROUP BY\u3092<strong>\u540c\u6642\u306b\u4f7f\u3046\u3068\u4e0d\u6574\u5408<\/strong>\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u3002<\/p>\n<\/li>\n<li>\n<p>\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u305f\u6642\u70b9\u3067\u3001ROW_NUMBER\u306e\u524d\u63d0\uff08\u884c\u5358\u4f4d\u3067\u306e\u4e26\u3073\uff09\u304c\u5d29\u308c\u307e\u3059\u3002<\/p>\n<\/li>\n<\/ul>\n<hr>\n<h3>\u6b63\u3057\u3044\u5b9f\u88c5\uff1a\u30b5\u30d6\u30af\u30a8\u30ea\u3084CTE\u3067\u5206\u96e2<\/h3>\n<pre><code>WITH ranked_logins <span>AS<\/span> (\r\n  SELECT\r\n    user_id,\r\n    login_date,\r\n    ROW_NUMBER() OVER (\r\n      PARTITION BY user_id\r\n      ORDER BY login_date DESC\r\n    ) <span>AS<\/span> rn\r\n  FROM user_logins\r\n)\r\nSELECT * FROM ranked_logins WHERE rn = <span>1<\/span>;<\/code><\/pre>\n<p>\u2192 <strong>\u30ed\u30b8\u30c3\u30af\u3092\u660e\u78ba\u306b\u5206\u3051\u308b<\/strong>\u3053\u3068\u3067\u3001\u610f\u56f3\u901a\u308a\u306e\u30c7\u30fc\u30bf\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n<hr>\n<h2>\u307e\u3068\u3081\uff1aROW_NUMBER()\u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306b<\/h2>\n<h3>\u8a18\u4e8b\u306e\u30dd\u30a4\u30f3\u30c8\u518d\u78ba\u8a8d<\/h3>\n<ul>\n<li>\n<p><strong>ROW_NUMBER()<\/strong>\uff1a\u4e26\u3073\u9806\u306b\u5fdc\u3058\u3066\u9023\u756a\u3092\u632f\u308b\u30a6\u30a3\u30f3\u30c9\u30a6\u95a2\u6570<\/p>\n<\/li>\n<li>\n<p><strong>PARTITION BY<\/strong>\uff1a\u30b0\u30eb\u30fc\u30d7\u3054\u3068\u306e\u9023\u756a\u3092\u4ed8\u3051\u308b<\/p>\n<\/li>\n<li>\n<p><strong>ORDER BY<\/strong>\uff1a\u4e26\u3073\u9806\u306e\u57fa\u6e96\u3092\u5b9a\u3081\u308b<\/p>\n<\/li>\n<li>\n<p><strong>\u30b5\u30d6\u30af\u30a8\u30ea \/ CTE<\/strong>\uff1a\u62bd\u51fa\u6761\u4ef6\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u969b\u306e\u5b9a\u756a\u30c6\u30af\u30cb\u30c3\u30af<\/p>\n<\/li>\n<\/ul>\n<p>ROW_NUMBER()\u3092\u7528\u3044\u305f\u5b9f\u884c\u74b0\u5883\u3092\u4f7f\u3044\u305f\u3044\u65b9\u306f<\/p>\n<ul>\n<li>\n<p><strong>\u30ed\u30fc\u30ab\u30eb\u306eMySQL\u74b0\u5883\uff088.0\u4ee5\u964d\uff09<\/strong><\/p>\n<\/li>\n<li>\n<p><strong>\u30aa\u30f3\u30e9\u30a4\u30f3SQL\u5b9f\u884c\u30b5\u30fc\u30d3\u30b9<\/strong><\/p>\n<\/li>\n<li>\n<p><strong>Docker\u3067\u7c21\u5358\u69cb\u7bc9\u3067\u304d\u308bMySQL\u30a4\u30e1\u30fc\u30b8<\/strong><\/p>\n<\/li>\n<\/ul>\n<p>\u306a\u3069\u3067\u8a66\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>\u3010\u5916\u90e8\u30ea\u30f3\u30af\u3011<\/h3>\n<p><a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/window-function-descriptions.html\">MySQL \u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8: Window Functions<\/a><\/p>\n<p><a href=\"https:\/\/www.sqltutorial.org\/sql-window-functions\/sql-row_number\/\">SQL Tutorial: ROW_NUMBER() \u95a2\u6570\u306e\u4f7f\u3044\u65b9<\/a><\/p>\n<p><a href=\"https:\/\/learn.microsoft.com\/ja-jp\/sql\/t-sql\/functions\/row-number-transact-sql\">Microsoft Docs: ROW_NUMBER \u95a2\u6570<\/a><\/p>\n<h3>\u3010\u5185\u90e8\u30ea\u30f3\u30af\u3011<\/h3>\n<p><a href=\"https:\/\/route-zero.com\/recruit\/route\/1233\/\">\u521d\u5fc3\u8005\u5411\u3051SQL\u8b1b\u5ea7\uff5cSELECT\u6587\u306e\u66f8\u304d\u65b9\u3068\u5b9f\u884c\u9806\u3092\u5b8c\u5168\u89e3\u8aac<\/a><\/p>\n<p><a href=\"https:\/\/route-zero.com\/recruit\/route\/989\/\">\u3010SQL\u3011\u526f\u554f\u3044\u5408\u308f\u305b\u5165\u9580\uff5c\u57fa\u672c\u69cb\u6587\u304b\u3089\u5b9f\u4f8b\u307e\u3067\u5fb9\u5e95\u89e3\u8aac<\/a><\/p>\n<p><a href=\"https:\/\/route-zero.com\/recruit\/route\/912\/\">\u3010Docker\u5165\u9580\u3011MySQL\u74b0\u5883\u3092\u624b\u8efd\u306b\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\u3092\u5fb9\u5e95\u89e3\u8aac<\/a><\/p>\n<\/div>\n","protected":false},"featured_media":1238,"template":"","_links":{"self":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route\/1237"}],"collection":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route"}],"about":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/types\/route"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media\/1238"}],"wp:attachment":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media?parent=1237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}