{"width":"100%","height":"190","categories":["\u30c6\u30af\u30ce\u30ed\u30b8\u30fc"],"author_url":"https://blog.hatena.ne.jp/konosumi/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fwww.konosumi.net%2Fentry%2F2019%2F12%2F29%2F232237\" title=\"SQL\u306eCOUNT\u95a2\u6570\u5185\u3067\u3001\u5224\u5b9a\u6761\u4ef6\u3092\u4f7f\u3063\u3066\u96c6\u8a08\u3059\u308b\u3068\u304d\u306f\u300cOR NULL\u300d\u3092\u8ffd\u52a0\u3057\u3088\u3046 - konosumi note\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2019-12-29 23:22:37","blog_title":"konosumi note","blog_url":"https://www.konosumi.net/","title":"SQL\u306eCOUNT\u95a2\u6570\u5185\u3067\u3001\u5224\u5b9a\u6761\u4ef6\u3092\u4f7f\u3063\u3066\u96c6\u8a08\u3059\u308b\u3068\u304d\u306f\u300cOR NULL\u300d\u3092\u8ffd\u52a0\u3057\u3088\u3046","url":"https://www.konosumi.net/entry/2019/12/29/232237","provider_name":"Hatena Blog","author_name":"konosumi","version":"1.0","type":"rich","image_url":null,"provider_url":"https://hatena.blog","description":"SQL\u306eSELECT\u7d50\u679c\u304b\u3089COUNT\u95a2\u6570\u3092\u4f7f\u3044\u3001\u8907\u6570\u306e\u30c7\u30fc\u30bf\u96c6\u8a08\u3092\u3057\u305f\u3044\u5c40\u9762\u304c\u3042\u308a\u307e\u3057\u305f\u3002 /* a\u306e\u30ab\u30e9\u30e0\u306b\u306f\u3001\u300c0\u300d\u3068\u300c3\u300d\u306e\u5024\u304c\u5165\u3063\u3066\u3044\u308b */ mysql> SELECT * FROM sample; +---+ | a | +---+ | 0 | | 3 | +---+ 2 rows in set (0.00 sec) \u305d\u3053\u3067\u6b21\u306eSQL\u3092\u5b9f\u884c\u3057\u305f\u306e\u3067\u3059\u304c\u3001\u60f3\u5b9a\u5916\u306e\u5024\u304c\u8fd4\u3063\u3066\u304d\u307e\u3057\u305f\u3002 /* COUNT(a > 1)\u306e\u7d50\u679c\u306f\u3001\u300c2\u300d\u306b\u306a\u308a\u307e\u3059 */ /* COUNT(a > 3)\u306e\u7d50\u679c\u3082\u3001\u300c2\u300d\u306b\u306a\u308a\u307e\u3059 */ mysql> SELECT COUNT(a > 1), COUNT(a \u2026"}