{"id":84488,"date":"2024-03-21T04:23:06","date_gmt":"2024-03-20T19:23:06","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e5%88%b6%e7%b4%84%e3%82%92%e8%bf%bd%e5%8a%a0%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%ef%bc%9f\/"},"modified":"2024-03-27T14:38:19","modified_gmt":"2024-03-27T05:38:19","slug":"sql%e5%88%b6%e7%b4%84%e3%82%92%e8%bf%bd%e5%8a%a0%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e5%88%b6%e7%b4%84%e3%82%92%e8%bf%bd%e5%8a%a0%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%ef%bc%9f\/","title":{"rendered":"SQL\u5236\u7d04\u3092\u8ffd\u52a0\u3059\u308b\u65b9\u6cd5\u306f\uff1f"},"content":{"rendered":"<p>SQL\u3067\u5236\u7d04\u3092\u8ffd\u52a0\u3067\u304d\u308b\u306e\u306f\u6b21\u306e\u65b9\u6cd5\u3067\u3059\u30021. \u30c6\u30fc\u30d6\u30eb\u4f5c\u6210\u6642\u306b\u5236\u7d04\u3092\u8ffd\u52a0\u3059\u308b\u3002\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u6642\u306b\u3001\u5217\u5b9a\u7fa9\u306e\u5f8c\u306b\u30ad\u30fc\u30ef\u30fc\u30c9\u300cCONSTRAINT\u300d\u3092\u4f7f\u7528\u3057\u3066\u5236\u7d04\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/p>\n<pre class=\"post-pre\">CREATE\u00a0TABLE\u00a0table_name\u00a0(<\/pre>\n<p>column1\u00a0datatype\u00a0constraint,<\/p>\n<p>&nbsp;<\/p>\n<p>column2\u00a0datatype\u00a0constraint,<\/p>\n<p>&nbsp;<\/p>\n<p>\u2026 );<\/p>\n<pre class=\"post-pre\"><\/pre>\n<p>\u300cconstraint\u300d\u306f\u6b21\u306e\u30bf\u30a4\u30d7\u306e\u3044\u305a\u308c\u304b\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002- PRIMARY KEY\uff1a\u5217\u3092\u4e3b\u30ad\u30fc\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u307e\u3059\u3002- UNIQUE\uff1a\u5217\u306e\u3059\u3079\u3066\u306e\u5024\u304c\u4e00\u610f\u3067\u3042\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002- NOT NULL\uff1a\u5217\u306e\u5024\u304c\u7a7a\u3067\u306f\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002- CHECK (condition)\uff1a\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u3088\u3046\u5217\u306e\u5024\u3092\u4fdd\u8a3c\u3059\u308b\u6761\u4ef6\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u30022. ALTER TABLE\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u5236\u7d04\u6761\u4ef6\u3092\u8ffd\u52a0\u3059\u308b\uff1a\u8868\u304c\u3059\u3067\u306b\u4f5c\u6210\u3055\u308c\u305f\u5f8c\u3067\u3001ALTER TABLE\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u5236\u7d04\u6761\u4ef6\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001<\/p>\n<pre class=\"post-pre\">ALTER\u00a0TABLE\u00a0table_name\r\nADD\u00a0CONSTRAINT\u00a0constraint_name\u00a0constraint;<\/pre>\n<p>\u5236\u7d04\u6761\u4ef6\u306e\u8ffd\u52a0\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u4f5c\u6210\u6642\u306b\u5236\u7d04\u6761\u4ef6\u3092\u8ffd\u52a0\u3059\u308b\u65b9\u6cd5\u3001ALTER TABLE\u6587\u3067\u5236\u7d04\u6761\u4ef6\u3092\u8ffd\u52a0\u3059\u308b\u65b9\u6cd5\u3001\u30c6\u30fc\u30d6\u30eb\u4f5c\u6210\u6642\u306b\u5236\u7d04\u6761\u4ef6\u306e\u7701\u7565\u8a18\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u3069\u306e\u65b9\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u304b\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u306e\u5bfe\u5fdc\u3084\u500b\u4eba\u306e\u597d\u307f\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002\u306a\u304a\u3001\u300cconstraint_name\u300d\u306f\u5236\u7d04\u6761\u4ef6\u306e\u540d\u524d\u3001\u300cconstraint\u300d\u306f\u5177\u4f53\u7684\u306a\u5236\u7d04\u6761\u4ef6\u3067\u3059\u3002\u307e\u305f\u3001\u7701\u7565\u8a18\u6cd5\u306f\u4e00\u90e8\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u307f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SQL\u3067\u5236\u7d04\u3092\u8ffd\u52a0\u3067\u304d\u308b\u306e\u306f\u6b21\u306e\u65b9\u6cd5\u3067\u3059\u30021. \u30c6\u30fc\u30d6\u30eb\u4f5c\u6210\u6642\u306b\u5236\u7d04\u3092\u8ffd\u52a0\u3059\u308b\u3002\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u6642\u306b\u3001\u5217\u5b9a\u7fa9\u306e\u5f8c\u306b\u30ad\u30fc\u30ef\u30fc\u30c9\u300cCONSTRAINT\u300d\u3092\u4f7f\u7528\u3057\u3066\u5236\u7d04\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a CREATE\u00a0TABLE\u00a0tabl [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-84488","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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