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似乎是标点打错了

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似乎是标点打错了
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数据存储/MySQL Index.md
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@ -55,7 +55,7 @@ MySQL的基本存储结构是页(记录都存在页里边)：
### 最左前缀原则
MySQL中的索引可以以一定顺序引用多列，这种索引叫作联合索引。如User表的name和city加联合索引就是(name,city)o而最左前缀原则指的是，如果查询的时候查询条件精确匹配索引的左边连续一列或几列，则此列就可以被用到。如下：
MySQL中的索引可以以一定顺序引用多列，这种索引叫作联合索引。如User表的name和city加联合索引就是(name,city)，而最左前缀原则指的是，如果查询的时候查询条件精确匹配索引的左边连续一列或几列，则此列就可以被用到。如下：
```
select * from user where name=xx and city=xx ; ／／可以命中索引