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Merge pull request #1807 from Carbda/patch-3

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在网页里面的格式有点问题，文字被拉长了，markdown里面加一行就可以解决
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Guide 2022-08-26 12:43:07 +08:00 committed by GitHub
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docs/database/mysql/mysql-index.md
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@ -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