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mysql，index_interview.md中写错了 #334

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Update index_interview.md
WwwwwyDev Apr 28, 2025
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Merge pull request #1 from WwwwwyDev/patch-1
WwwwwyDev Apr 28, 2025
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2 changes: 1 addition & 1 deletion mysql/index/index_interview.md
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Expand Up @@ -576,7 +576,7 @@ const 类型表示使用了主键或者唯一索引与常量值进行比较，
这里说几个重要的参考指标：

- Using filesort：当查询语句中包含 order by 操作，而且无法利用索引完成排序操作的时候，这时不得不选择相应的排序算法进行，甚至可能会通过文件排序，效率是很低的，所以要避免这种问题的出现。
- Using temporary：使了用临时表保存中间结果，MySQL 在对查询结果排序时使用临时表，常见于排序 order by 和分组查询 group by。效率低，要避免这种问题的出现。
- Using temporary：使用了临时表保存中间结果，MySQL 在对查询结果排序时使用临时表，常见于排序 order by 和分组查询 group by。效率低，要避免这种问题的出现。
- Using index：所需数据只需在索引即可全部获得，不须要再到表中取数据，也就是使用了覆盖索引，避免了回表操作，效率不错。

## 总结
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