MySQL中的事务隔离级别包括四种:READ UNCOMMITTED(读未提交)、READ COMMITTED(读已提交)、REPEATABLE READ(可重复读)和SERIALIZABLE(串行化)。MySQL默认的事务隔离级别是REPEATABLE READ。您可以使用以下语句设置事务隔离级别:
```sql
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
```
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