{"id":91781,"date":"2024-03-21T14:20:33","date_gmt":"2024-03-21T05:20:33","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e3%81%aeif%e6%9d%a1%e4%bb%b6%e6%96%87%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/"},"modified":"2024-04-05T21:56:50","modified_gmt":"2024-04-05T12:56:50","slug":"sql%e3%81%aeif%e6%9d%a1%e4%bb%b6%e6%96%87%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e3%81%aeif%e6%9d%a1%e4%bb%b6%e6%96%87%e3%81%ae%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95\/","title":{"rendered":"SQL\u306eIF\u6761\u4ef6\u6587\u306e\u4f7f\u7528\u65b9\u6cd5"},"content":{"rendered":"<p>SQL \u3067\u306f\u901a\u5e38\u3001IF \u6761\u4ef6\u5f0f\u306e\u3088\u3046\u306a\u30ed\u30b8\u30c3\u30af\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b CASE \u5f0f\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002CASE \u5f0f\u306f SELECT\u3001WHERE \u306a\u3069\u3001\u5f0f\u304c\u8a31\u53ef\u3055\u308c\u308b\u5834\u6240\u3067\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u3061\u3089\u304c\u3001CASE \u5f0f\u3067 IF \u6761\u4ef6\u6587\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\u306e\u4f8b\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> column1, \r\n       column2, \r\n       <span class=\"hljs-keyword\">CASE<\/span> \r\n           <span class=\"hljs-keyword\">WHEN<\/span> condition1 <span class=\"hljs-keyword\">THEN<\/span> result1\r\n           <span class=\"hljs-keyword\">WHEN<\/span> condition2 <span class=\"hljs-keyword\">THEN<\/span> result2\r\n           <span class=\"hljs-keyword\">ELSE<\/span> result3\r\n       <span class=\"hljs-keyword\">END<\/span> <span class=\"hljs-keyword\">AS<\/span> new_column\r\n<span class=\"hljs-keyword\">FROM<\/span> table_name;\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001column1\u3068column2\u304c\u691c\u7d22\u3059\u308b\u5217\u3001condition1\u3068condition2\u306f\u6761\u4ef6\u5f0f\u3001result1\u3001result2\u3001result3\u306f\u6761\u4ef6\u306b\u57fa\u3044\u3066\u8a08\u7b97\u3057\u305f\u7d50\u679c\u3067\u3059\u3002new_column\u306f\u6761\u4ef6\u5f0f\u306b\u3088\u308a\u5024\u304c\u6c7a\u307e\u308b\u65b0\u3057\u3044\u5217\u3067\u3059\u3002<\/p>\n<p>WHEN-THEN \u306e\u5206\u5c90\u3092\u8ffd\u52a0\u3057\u3066\u3001\u3088\u308a\u591a\u304f\u306e\u6761\u4ef6\u306b\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u6761\u4ef6\u306b\u5f53\u3066\u306f\u307e\u3089\u306a\u3044\u5834\u5408\u3001ELSE \u53e5\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6ce8\u610f\u3001CASE \u5f0f\u306f\u5165\u308c\u5b50\u306b\u3057\u3066\u4f7f\u3048\u3066\u3001\u8907\u96d1\u306a\u6761\u4ef6\u8ad6\u7406\u3092\u51e6\u7406\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SQL \u3067\u306f\u901a\u5e38\u3001IF \u6761\u4ef6\u5f0f\u306e\u3088\u3046\u306a\u30ed\u30b8\u30c3\u30af\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b CASE \u5f0f\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002CASE \u5f0f\u306f SELECT\u3001WHERE \u306a\u3069\u3001\u5f0f\u304c\u8a31\u53ef\u3055\u308c\u308b\u5834\u6240\u3067\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002 \u3053\u3061\u3089\u304c\u3001CASE \u5f0f\u3067 IF \u6761\u4ef6\u6587\u3092\u5b9f\u73fe [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-91781","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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