{"id":125728,"date":"2024-03-24T19:57:50","date_gmt":"2024-03-24T10:57:50","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/sql-%e3%82%ab%e3%82%a6%e3%83%b3%e3%83%88%e9%96%a2%e6%95%b0%e3%81%ae%e5%88%a9%e7%94%a8%e6%b3%95\/"},"modified":"2024-04-05T11:52:12","modified_gmt":"2024-04-05T02:52:12","slug":"sql-%e3%82%ab%e3%82%a6%e3%83%b3%e3%83%88%e9%96%a2%e6%95%b0%e3%81%ae%e5%88%a9%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/sql-%e3%82%ab%e3%82%a6%e3%83%b3%e3%83%88%e9%96%a2%e6%95%b0%e3%81%ae%e5%88%a9%e7%94%a8%e6%b3%95\/","title":{"rendered":"SQL \u30ab\u30a6\u30f3\u30c8\u95a2\u6570\u306e\u5229\u7528\u6cd5"},"content":{"rendered":"<p>SQL \u306e COUNT \u95a2\u6570\u306f\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u884c\u6570\u3092\u6570\u3048\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u30ec\u30b3\u30fc\u30c9\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>COUNT\u95a2\u6570\u306e\u57fa\u672c\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>SELECT COUNT(column_name)\r\nFROM table_name\r\nWHERE condition;\r\n<\/code><\/pre>\n<p>\u30ab\u30e9\u30e0\u540d\uff08column_name\uff09\u306f\u3001\u30ab\u30a6\u30f3\u30c8\u5bfe\u8c61\u306e\u5217\u306e\u540d\u524d\u3092\u3001\u30c6\u30fc\u30d6\u30eb\u540d\uff08table_name\uff09\u306f\u30af\u30a8\u30ea\u3059\u308b\u30c6\u30fc\u30d6\u30eb\u306e\u540d\u524d\u3092\u3001\u6761\u4ef6\uff08condition\uff09\u306f\u30ab\u30a6\u30f3\u30c8\u306e\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002condition\u3092\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u3001COUNT\u95a2\u6570\u306f\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u884c\u5168\u4f53\u3092\u30ab\u30a6\u30f3\u30c8\u3057\u307e\u3059\u3002<\/p>\n<p>COUNT \u95a2\u6570\u306f\u3001\u30b0\u30eb\u30fc\u30d7\u5316\u5b50\u53e5 GROUP BY \u3068\u3068\u3082\u306b\u4f7f\u7528\u3057\u3066\u3001\u5404\u30b0\u30eb\u30fc\u30d7\u5185\u306e\u884c\u6570\u3092\u96c6\u8a08\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u300cstudents\u300d\u3068\u3044\u3046\u540d\u306e\u751f\u5f92\u306e\u60c5\u5831\u3092\u683c\u7d0d\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b\u3068\u3057\u3066\u3001\u305d\u306e\u30c6\u30fc\u30d6\u30eb\u751f\u5f92\u306e\u7dcf\u6570\u3092\u6570\u3048\u308b\u306b\u306f\u3001\u6b21\u306eSQL\u6587\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>SELECT COUNT(*)\r\nFROM students;\r\n<\/code><\/pre>\n<p>\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u751f\u5f92\u306e\u6570\u3092\u8868\u304b\u3089\u6570\u3048\u308b\u306b\u306f\u3001\u6b21\u306e\u3088\u3046\u306bWHERE\u53e5\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>SELECT COUNT(*)\r\nFROM students\r\nWHERE age &gt;= 18;\r\n<\/code><\/pre>\n<p>18\u6b73\u4ee5\u4e0a\u306e\u5b66\u751f\u306e\u4eba\u6570\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SQL \u306e COUNT \u95a2\u6570\u306f\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u884c\u6570\u3092\u6570\u3048\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u30ec\u30b3\u30fc\u30c9\u6570\u3092\u30ab\u30a6\u30f3\u30c8\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002 COUNT\u95a2\u6570\u306e\u57fa\u672c\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-125728","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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