摘要：
一.定义表变量DECLARE @T1 table(UserID int ,UserName nvarchar(50),CityName nvarchar(50));insert into @T1 (UserID,UserName,CityName) values (1,'a','上海')insert into @T1 (UserID,UserName,CityName) values (2,'b','北京')insert into @T1 (UserID,UserName,CityName) values (3,'c 阅读全文