https://ascwh.com/98.html zh-CN 一、一些常见的SQL实践(1)负向条件查询不能使用索引select * from order where status!=0 and stauts!=1----not in/not exists... Thu, 01 Jan 1970 08:00:00 +0800 Thu, 01 Jan 1970 08:00:00 +0800