{"provider_url":"https://hatena.blog","author_name":"HTN20190109","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2024%2F11%2F02%2F145255\" title=\"{\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u4f5c\u6210\u305d\u306e\u4ed6}\u5236\u7d04\u540d\u3092\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,"categories":["\u6f14\u7fd2"],"blog_url":"https://htn20190109.hatenablog.com/","height":"190","author_url":"https://blog.hatena.ne.jp/HTN20190109/","url":"https://htn20190109.hatenablog.com/entry/2024/11/02/145255","provider_name":"Hatena Blog","width":"100%","published":"2024-11-02 14:52:55","blog_title":"HTN20190109\u306e\u65e5\u8a18","type":"rich","description":"https://docs.oracle.com/cd/F19136_01/sqlrf/ALTER-TABLE.html drop table tab1 purge;drop table tab2 purge; create table tab1(col1 int, col2 int);create table tab2(col1 int, col2 int, col3 int); alter table tab1 add constraint pk1 primary key(col1);alter table tab2 add constraint pk2 primary key(col1,c\u2026","version":"1.0","title":"{\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u4f5c\u6210\u305d\u306e\u4ed6}\u5236\u7d04\u540d\u3092\u5909\u66f4"}