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2 changes: 1 addition & 1 deletion docs/database/MySQL Index.md
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5. 在经常用在连接的列上,这 些列主要是一些外键,可以加快连接的速度;

6. 避免 where 子句中对宇段施加函数,这会造成无法命中索引。
6. 避免 where 子句中对字段施加函数,这会造成无法命中索引。

7. 在使用InnoDB时使用与业务无关的自增主键作为主键,即使用逻辑主键,而不要使用业务主键。

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