{"url":"https://htn20190109.hatenablog.com/entry/2022/09/23/032419","published":"2022-09-23 03:24:19","blog_url":"https://htn20190109.hatenablog.com/","height":"190","title":"\u30bb\u30df\u30b8\u30e7\u30a4\u30f3/\u30a2\u30f3\u30c1\u30b8\u30e7\u30a4\u30f3","type":"rich","description":"\u4f5c\u696d\u6982\u8981\uff1a\u300cin\u300d\u300cexists\u300d\u300cnot in\u300d\u300cnot exists\u300d\u305d\u308c\u305e\u308c\u306b\u3064\u3044\u3066\u7d50\u5408\u30ad\u30fc\u30ab\u30e9\u30e0\u304c nullable \u306e\u5834\u5408\u3068not null\u306e\u5834\u5408\u306e\u5b9f\u884c\u8a08\u753b\u3092\u78ba\u8a8d\u3057\u305f \u7d50\u679c\uff1a\u300cin\u300d\u300cexists\u300d\u300cnot exists\u300d\u306b\u3064\u3044\u3066\u306f\u3001\u7d50\u5408\u30ad\u30fc\u30ab\u30e9\u30e0\u306enull\u5c5e\u6027\u306b\u95a2\u4fc2\u306a\u304f\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u4f7f\u7528\u3055\u308c\u305f\u3002 \u300cnot in\u300d\u306b\u3064\u3044\u3066\u306f\u3001\u7d50\u5408\u30ad\u30fc\u30ab\u30e9\u30e0\u306enull\u5c5e\u6027\u306b\u4f9d\u5b58\u3057\u3066\u5b9f\u884c\u8a08\u753b\u304c\u5909\u5316\u3057\u305f\u3002 \u7d50\u5408\u30ad\u30fc\u30ab\u30e9\u30e0\u304c nullable \u306e\u5834\u5408\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u3068\u306a\u3063\u305f\u3002(MySQL\u3001Oracle\u3001PostgreSQL\u3001SQL Server)\u7d50\u5408\u30ad\u30fc\u30ab\u30e9\u30e0\u304c n\u2026","version":"1.0","provider_url":"https://hatena.blog","blog_title":"HTN20190109\u306e\u65e5\u8a18","width":"100%","provider_name":"Hatena Blog","author_name":"HTN20190109","author_url":"https://blog.hatena.ne.jp/HTN20190109/","categories":["DB"],"image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2022%2F09%2F23%2F032419\" title=\"\u30bb\u30df\u30b8\u30e7\u30a4\u30f3/\u30a2\u30f3\u30c1\u30b8\u30e7\u30a4\u30f3 - HTN20190109\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>"}