mysql 不能执行delete检查safe-updates模式 解除输入的安全模式，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
报错信息：
show variables like 'SQL_SAFE_UPDATES';
SET SQL_SAFE_UPDATES = 0;