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Merge pull request #354 from lijunn/master

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Update 事务隔离级别(图文详解).md
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docs/database/事务隔离级别(图文详解).md
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@ -69,7 +69,7 @@
| REPEATABLE-READ | × | × | √ |
| SERIALIZABLE | × | × | × |
MySQL InnoDB 存储引擎的默认支持的隔离级别是 **REPEATABLE-READ（可重读）**。我们可以通过`SELECT @@tx_isolation;`命令来查看
MySQL InnoDB 存储引擎的默认支持的隔离级别是 **REPEATABLE-READ（可重读）**。我们可以通过`SELECT @@tx_isolation;`命令来查看,MySQL 8.0 该命令改为`SELECT @@transaction_isolation;`
```sql
mysql> SELECT @@tx_isolation;