使用MySQL执行update的时候报错：Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column To disable safe mode, toggle the option in Preferences -> SQL Queries and reconnect.

在使用mysql执行update的时候，如果不是用主键当where语句，会报如下错误，使用主键用于where语句中正常。

解决办法：

1、show variables like 'SQL_SAFE_UPDATES';查看开关状态。
2、执行命令SET SQL_SAFE_UPDATES = 0;修改下数据库模式

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