{"published":"2006-11-02 21:49:11","author_url":"https://blog.hatena.ne.jp/chaichanPaPa/","height":"190","type":"rich","provider_url":"https://hatena.blog","description":"\u307e\u305a\u3001DB\u4e0a\u306eNULL\u3068\u306f\u3001\u5024\u3067\u3082\u5909\u6570\u3067\u3082\u306a\u304f\u3001\u4f55\u3082\u306a\u3044\u72b6\u614b\u3092\u4e91\u3044\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001SQL\u30b5\u30fc\u30d0\u30fc\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u3001NOT NULL\u5236\u7d04\u3067\u306a\u3044\u9805\u76ee\u306f\u3001\u6587\u5b57\u5217\u7cfb\u9805\u76ee\uff08char,varchar\u7b49\uff09\u3067\u3082\u6570\u5024\u7cfb\u9805\u76ee\uff08int,decimal\u7b49\uff09\u3067\u3082\u3001\u5f53\u7136\u3001\u4f55\u3082\u306a\u3044\u72b6\u614b\u306fNULL\u306a\u306e\u3067\u3059\u3002 \u3064\u307e\u308a\u3001SQL\u306eWhere\u53e5\u3067NULL\u3092\u5f15\u3063\u639b\u3051\u308b\u3068\u304d\u306b\u306f\u3001\u5024\u3067\u3082\u5909\u6570\u3067\u3082\u306a\u3044\u306e\u3067\u6bd4\u8f03\u8ff0\u8a9e\uff08= NULL\uff09\u306f\u4f7f\u3048\u305a\u3001\u300eIS NULL\u300f\u3092\u4f7f\u3044\u307e\u3059\u3002\u304b\u308a\u306b\u3001\u6bd4\u8f03\u8ff0\u8a9e\u3092\u4f7f\u3063\u305f\u5834\u5408\u306f\u3001\u9069\u7528\u7d50\u679c\u306f\u3001ture \u3067\u306a\u304f false \u3067\u3082\u306a\u304f\u5fc5\u305a unknown \u306b\u306a\u308b\u3068\u306e\u3053\u3068\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u6bd4\u8f03\u8ff0\u8a9e\uff08= NULL\uff09\u3067\u306fNULL\u3092\u5224\u65ad\u2026","title":" SQL\u30b5\u30fc\u30d0\u30fc\u3068VB6(VBA)\u3067\u306eNULL\u306e\u6271\u3044","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fchaipa.hateblo.jp%2Fentry%2F20061102%2F1162471751\" title=\" SQL\u30b5\u30fc\u30d0\u30fc\u3068VB6(VBA)\u3067\u306eNULL\u306e\u6271\u3044 - \u65e7\u71c8\u660e\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>","url":"https://chaipa.hateblo.jp/entry/20061102/1162471751","categories":["VB-TIPS"],"version":"1.0","width":"100%","blog_url":"https://chaipa.hateblo.jp/","blog_title":"\u65e7\u71c8\u660e\u65e5\u8a18","provider_name":"Hatena Blog","author_name":"chaichanPaPa"}