{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2020%2F08%2F16%2F191848\" title=\"NULL\u306e\u8868\u793a - HTN20190109\u306e\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>","version":"1.0","provider_name":"Hatena Blog","provider_url":"https://hatena.blog","published":"2020-08-16 19:18:48","url":"https://htn20190109.hatenablog.com/entry/2020/08/16/191848","description":"MySQL (5.6) drop table tab1;create table tab1(col1 int,col2 varchar(10));insert into tab1(col1,col2) values(1,'');insert into tab1(col1,col2) values(2,'NULL');insert into tab1(col1) values(3);select * from tab1; \u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u30cc\u30eb\u306e\u5834\u5408\u306fNULL\u3068\u8868\u793a\u3055\u308c\u308b\u3002\u30cc\u30eb\u3068\u7a7a\u6587\u5b57\u306f\u533a\u5225\u3055\u308c\u308b\u3002\u203b\u30cc\u30eb\u306e\u8868\u793a\u3092\u5909\u66f4\u3059\u308b\u65b9\u6cd5\u306f\u306a\u3044\u6a21\u69d8 \u203b\u30cc\u30eb\u3092\u6587\u5b57\u5217\u7f6e\u63db\u3057\u305f\u3044\u5834\u5408select * from tab1;\u2026","image_url":null,"blog_title":"HTN20190109\u306e\u65e5\u8a18","author_url":"https://blog.hatena.ne.jp/HTN20190109/","width":"100%","title":"NULL\u306e\u8868\u793a","type":"rich","height":"190","blog_url":"https://htn20190109.hatenablog.com/","author_name":"HTN20190109","categories":["DB"]}