{"author_url":"https://blog.hatena.ne.jp/HTN20190109/","author_name":"HTN20190109","height":"190","provider_name":"Hatena Blog","categories":["DB"],"width":"100%","image_url":null,"description":"MySQL (8.0.29) drop table tab1;create table tab1(col1 int not null, col2 int);insert into tab1 values(1,1); select * from tab1; analyze table tab1; explain analyzeselect * from tab1 where ifnull(col1,0) != 0 and ifnull(col2,0) != 0; \u2192NOT NULL\u30ab\u30e9\u30e0\u3078\u306eifnull\u306f\u9664\u53bb\u3055\u308c\u306a\u3044 Oracle (19c) drop table tab1 purge;crea\u2026","blog_url":"https://htn20190109.hatenablog.com/","title":" not null\u30ab\u30e9\u30e0\u306bnvl\u4f7f\u7528\u6642\u306e\u5b9f\u884c\u8a08\u753b","provider_url":"https://hatena.blog","type":"rich","published":"2022-09-02 23:12:08","url":"https://htn20190109.hatenablog.com/entry/2022/09/02/231208","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhtn20190109.hatenablog.com%2Fentry%2F2022%2F09%2F02%2F231208\" title=\" not null\u30ab\u30e9\u30e0\u306bnvl\u4f7f\u7528\u6642\u306e\u5b9f\u884c\u8a08\u753b - 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>","blog_title":"HTN20190109\u306e\u65e5\u8a18","version":"1.0"}