MySQL执行delete报错：Error Code: 1175

delete from T1 where C1 in (xxx, xxx)

执行以上sql时报错：

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

原因：

SQL_SAFE_UPDATES = ON 的时候，非主键条件下无法执行update/delete

解决：

查状态，如果是ON，把状态改成OFF

show variables like 'SQL_SAFE_UPDATES'
set SQL_SAFE_UPDATES = OFF