Update mysql-index.md

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- MySQL
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> 感谢**[WT-AHA](https://github.com/WT-AHA)** 对本人的完善,相关 PRhttps://github.com/Snailclimb/JavaGuide/pull/1648 。
> 感谢[WT-AHA](https://github.com/WT-AHA)对本文的完善,相关 PRhttps://github.com/Snailclimb/JavaGuide/pull/1648 。
## 何为索引?有什么作用?