{"author_url":"https://blog.hatena.ne.jp/HTN20190109/","title":"\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u5909\u66f4","blog_url":"https://htn20190109.hatenablog.com/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2021%2F07%2F03%2F133734\" title=\"\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u5909\u66f4 - 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,"provider_url":"https://hatena.blog","type":"rich","author_name":"HTN20190109","blog_title":"HTN20190109\u306e\u65e5\u8a18","url":"https://htn20190109.hatenablog.com/entry/2021/07/03/133734","published":"2021-07-03 13:37:34","version":"1.0","provider_name":"Hatena Blog","height":"190","width":"100%","categories":["DB"],"description":"MySQL (8.0.22) https://dev.mysql.com/doc/refman/8.0/ja/alter-table-partition-operations.html drop table tab1; create table tab1( col1 int, col2 int, col3 int); alter table tab1 add constraint tab1pk primary key(col1); create index ind12 on tab1(col2);create index ind13 on tab1(col1,col2);create inde\u2026"}