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Update MySQL.md

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docs/database/MySQL.md
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@ -245,12 +245,12 @@ SQL 标准定义了四个隔离级别：
---
| 隔离级别 | 脏读 | 不可重复读 | 幻影读 |
| :--------------: | :--: | :--------: | :----: |
| READ-UNCOMMITTED | √ | √ | √ |
| READ-COMMITTED | × | √ | √ |
| REPEATABLE-READ | × | × | √ |
| SERIALIZABLE | × | × | × |
| 隔离级别 | 脏读 | 不可重复读 | 幻读 |
| :--------------: | :--: | :--------: | :--: |
| READ-UNCOMMITTED | √ | √ | √ |
| READ-COMMITTED | × | √ | √ |
| REPEATABLE-READ | × | × | √ |
| SERIALIZABLE | × | × | × |
### MySQL 的默认隔离级别是什么?