一直在sqlserver下写东西，突然用mysql有些语法发生了改变，有点折腾
(MS SQL Server)语句：update A set a.Name = b.Name from A a, B b where a.id = b.id
(Mysql)语句：: update A a,B b set a.Name = b.Name where a.id = b.id
原文：http://www.cnblogs.com/ariklee/p/3938121.html