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1 change: 1 addition & 0 deletions docs/database/mysql/mysql-index.md
Original file line number Diff line number Diff line change
Expand Up @@ -187,6 +187,7 @@ SELECT id FROM table WHERE id=1;
> 那么直接根据这个索引就可以查到数据,也无需回表。

覆盖索引:

![](https://img-blog.csdnimg.cn/20210420165341868.png)

## 联合索引
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