{"height":"190","width":"100%","provider_name":"Hatena Blog","version":"1.0","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fy0m0r.hateblo.jp%2Fentry%2F20140926%2F1411745450\" title=\"MySQL\u3067NULL\u3092\u7a7a\u6587\u5b57\u306b\u5909\u63db - ifnull\u3068nullif - \u30e1\u30e2\u7f6e\u304d\u5834\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2014-09-26 00:30:50","type":"rich","blog_title":"\u30e1\u30e2\u7f6e\u304d\u5834","author_url":"https://blog.hatena.ne.jp/yuheiomori0718/","categories":["mysql"],"author_name":"yuheiomori0718","title":"MySQL\u3067NULL\u3092\u7a7a\u6587\u5b57\u306b\u5909\u63db - ifnull\u3068nullif","url":"https://y0m0r.hateblo.jp/entry/20140926/1411745450","image_url":null,"blog_url":"https://y0m0r.hateblo.jp/","description":"\u30c7\u30fc\u30bf\u8abf\u67fb\u3067SQL\u306e\u51fa\u529b\u5185\u5bb9\u3092\u30b9\u30d7\u30ec\u30c3\u30c9\u30b7\u30fc\u30c8\u306b\u8cbc\u308a\u3064\u3051\u308b\u3068\u304d\u3001NULL\u304c\u5165\u308b\u3068\u90aa\u9b54\u306a\u306e\u3067\u3002mysql\u3067\u3084\u3063\u305f\u3053\u3068\u306a\u304b\u3063\u305f\u306e\u3067\u8abf\u3079\u305f\u3002ifnull\u3060\u3063\u305f\u3002 mysql> select ifnull(null, 'yes'); +---------------------+ | ifnull(null, 'yes') | +---------------------+ | yes | +---------------------+ 1 row in set (0.00 sec) nullif\u306a\u3093\u3066\u306e\u3082\u3042\u308b nullif\u306f\u6e21\u3055\u308c\u305f\u5024\u304cequal\u3060\u3068NULL\u306b\u306a\u308b mysql> select nul\u2026"}