{"categories":["\u96d1\u8a18"],"author_name":"shinkufencer","author_url":"https://blog.hatena.ne.jp/shinkufencer/","image_url":null,"title":"SQL\u3067\u300eCOUNT(\u6761\u4ef6\u5f0f OR NULL)\u300f\u306e\u539f\u7406\u3092\u5fd8\u308c\u308b\u306e\u3067\u5099\u5fd8\u9332\u3068\u3057\u3066\u66f8\u3044\u305f","description":"Qiita\u306e\u307b\u3046\u304cMarkdown\u304c\u7dba\u9e97\u306b\u304b\u3051\u308b\u306e\u3067\u3001\u5b9f\u4f8b\u8fbc\u307f\u7248\u306f\u305d\u3063\u3061\u306b\u66f8\u3044\u305f qiita.com \u8981\u7d04 COUNT(\u30ab\u30e9\u30e0) \u3067\u30ab\u30e9\u30e0\u304cNULL\u3067\u306a\u3044\u3082\u306e\u3092\u30ab\u30a6\u30f3\u30c8\u3059\u308b \u30ab\u30e9\u30e0 \u306b\u306f id == 1 \u306e\u3088\u3046\u306a\u6761\u4ef6\u5f0f\u304c\u6307\u5b9a\u3067\u304d\u308b\u3001\u304c\u6761\u4ef6\u5f0f\u306f1\u304b0\u306e\u3069\u3061\u3089\u304b\u304c\u8fd4\u5374\u3055\u308c\u308b\u306e\u3067\u5168\u3066\u304c\u30ab\u30a6\u30f3\u30c8\u3055\u308c\u3066\u3057\u307e\u3046\u3002 OR\u6761\u4ef6\u306fNULL\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u306b\u3088\u308a\u3001 \u5bfe\u8c61 OR NULL \u3068\u3059\u308b\u3068 \u5bfe\u8c61\u304c 0 \u304b NULL \u306b\u306a\u308b\u3068 NULL\u306b\u7f6e\u304d\u63db\u308f\u308b\uff08\u305f\u3060\u3057\u5bfe\u8c61\u304c\u6570\u5024\u306e\u5834\u5408\uff09 \u6761\u4ef6\u5f0f OR NULL \u306b\u3059\u308b\u3068\u3001\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u3089\u306a\u3044\u3082\u306e\u306f\u5168\u3066NULL\u306b\u306a\u308b \u305d\u306e\u305f\u3081 COUNT (\u6761\u4ef6\u5f0f OR NULL) \u306b\u3059\u2026","height":"190","provider_name":"Hatena Blog","width":"100%","version":"1.0","blog_url":"https://shinkufencer.hateblo.jp/","provider_url":"https://hatena.blog","blog_title":"\u30b3\u30fc\u30c9\u65e5\u9032\u6708\u6b69","published":"2018-08-21 23:53:09","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fshinkufencer.hateblo.jp%2Fentry%2F2018%2F08%2F21%2F235309\" title=\"SQL\u3067\u300eCOUNT(\u6761\u4ef6\u5f0f OR NULL)\u300f\u306e\u539f\u7406\u3092\u5fd8\u308c\u308b\u306e\u3067\u5099\u5fd8\u9332\u3068\u3057\u3066\u66f8\u3044\u305f - \u30b3\u30fc\u30c9\u65e5\u9032\u6708\u6b69\" 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://shinkufencer.hateblo.jp/entry/2018/08/21/235309","type":"rich"}