{"height":"190","blog_title":"chamotarooo\u306e\u30d6\u30ed\u30b0","type":"rich","author_url":"https://blog.hatena.ne.jp/chamotarooo/","categories":[],"image_url":"https://m.media-amazon.com/images/I/41DyQOCNuCL._SL500_.jpg","published":"2026-03-30 10:17:23","width":"100%","description":"NULL\u306f\u300c\u30bc\u30ed\u300d\u3067\u3082\u300c\u7a7a\u6587\u5b57\u5217\u300d\u3067\u3082\u300cFALSE\u300d\u3067\u3082\u306a\u3044\u3002NULL\u306f\u300c\u4e0d\u660e\u300d\u3060\u3002 \u2015 Bill Karwin\uff08\u300eSQL\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u300f\u8457\u8005\uff09 \u306f\u3058\u3081\u306b NULL\u304c\u5acc\u3044\u306a\u958b\u767a\u8005\u306f\u591a\u3044\u3002assigned_to = NULL \u304c\u52d5\u304b\u306a\u3044\u3001count() \u306e\u6319\u52d5\u304c\u4e88\u60f3\u5916\u3001\u6587\u5b57\u5217\u9023\u7d50\u3067\u5168\u90e8NULL\u306b\u306a\u308b\u3002\u305d\u306e\u7d4c\u9a13\u304b\u3089NULL\u3092 -1 \u3084 'N/A' \u3067\u7f6e\u304d\u63db\u3048\u308b\u8a2d\u8a08\u3092\u9078\u3076\u3053\u3068\u304c\u3042\u308b\u3002 \u672c\u66f814\u7ae0\u300c\u30d5\u30a3\u30a2\u30fb\u30aa\u30d6\u30fb\u30b8\u30fb\u30a2\u30f3\u30ce\u30a6\u30f3\uff08\u6050\u6016\u306eunknown\uff09\u300d\u306f\u3001\u3053\u306e\u5224\u65ad\u3092\u9006\u52b9\u679c\u3068\u6307\u6458\u3059\u308b\u3002NULL\u304b\u3089\u9003\u3052\u308b\u3068\u3001\u4ee3\u308f\u308a\u306b\u7279\u6b8a\u5024\u306e\u7ba1\u7406\u3068\u3044\u3046\u8907\u96d1\u3055\u3092\u5f15\u304d\u53d7\u3051\u308b\u3053\u3068\u306b\u306a\u308b\u3002 NULL\u306e\u672c\u8cea\u3092\u7406\u89e3\u3059\u308c\u3070\u3001\u9003\u3052\u308b\u5fc5\u8981\u306f\u2026","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fchamotaro.hatenablog.com%2Fentry%2F2026%2F03%2F30%2F101723\" title=\"\u30d5\u30a3\u30a2\u30fb\u30aa\u30d6\u30fb\u30b8\u30fb\u30a2\u30f3\u30ce\u30a6\u30f3\u2500\u2500NULL\u304b\u3089\u9003\u3052\u308b\u306a\u3010SQL\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3 14\u7ae0\u3011 - chamotarooo\u306e\u30d6\u30ed\u30b0\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_name":"chamotarooo","blog_url":"https://chamotaro.hatenablog.com/","provider_url":"https://hatena.blog","provider_name":"Hatena Blog","title":"\u30d5\u30a3\u30a2\u30fb\u30aa\u30d6\u30fb\u30b8\u30fb\u30a2\u30f3\u30ce\u30a6\u30f3\u2500\u2500NULL\u304b\u3089\u9003\u3052\u308b\u306a\u3010SQL\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3 14\u7ae0\u3011","url":"https://chamotaro.hatenablog.com/entry/2026/03/30/101723","version":"1.0"}