数据库优化之sql优化

少林码僧发布时间：2017-05-30 23:13:45 ，浏览量：2

不在索引列进行数学运算或凼数运算
拒绝大SQL拆解成多条简单SQL
优先使用ENUM或SET
- - 可能值已知且有限
改写OR为IN
改写OR为UNION
避免前缀模糊查询
同数据类型的列值比较
避免使用NULL字段
少用并拆分TEXTBLOB

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数据库优化之sql优化

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