MySQL提示的错误信息：
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
意思是：在安全更新模式下尝试使用未带关键字的“WHERE”语句，在Preference中切换该选项。
SET SQL_SAFE_UPDATES = 0; #关闭安全模式
SET SQL_SAFE_UPDATES = 1; #开启安全模式
Error Code: 1175. You are using safe update mode and you tried to ......
原文：http://www.cnblogs.com/liaojie970/p/4805057.html