{"author_url":"https://blog.hatena.ne.jp/HTN20190109/","author_name":"HTN20190109","published":"2019-04-23 02:57:11","height":"190","type":"rich","provider_name":"Hatena Blog","url":"https://htn20190109.hatenablog.com/entry/2019/04/23/025711","categories":["DB"],"width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2019%2F04%2F23%2F025711\" title=\"\u95a2\u6570\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 - 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>","image_url":null,"version":"1.0","provider_url":"https://hatena.blog","title":"\u95a2\u6570\u30a4\u30f3\u30c7\u30c3\u30af\u30b9","description":"Oracle create index f_ind11 on tab1(to_char(col1)); MySQL https://qiita.com/hmatsu47/items/128ece7276e4deac1477 (5.7)\u751f\u6210\u30ab\u30e9\u30e0\uff08generated column\uff09 create table tab9( col1 int, col2 varchar(3), col3 varchar(4) as ( CONCAT(col2,'0'))); insert into tab9(col1,col2) values(1,'abc'); alter table tab9 add index \u2026","blog_title":"HTN20190109\u306e\u65e5\u8a18","blog_url":"https://htn20190109.hatenablog.com/"}