摘要: 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 select * from order where status!=0 and stauts!=1 not in/not exists都不是好 阅读全文
posted @ 2017-09-28 11:24 HappyDeveloper 阅读(232) 评论(1) 推荐(0) 编辑