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‘,‘上海‘)insert into @T1 (UserID,UserName,CityName) values (4,‘d‘,‘北京‘)insert into @T1 (UserID,UserName,CityName) values (5,‘e‘,‘上海‘)select * from @T1-----最优的方式SELECT CityName,STUFF((SELECT ‘,‘ + UserName FROM @T1 subTitle WHERE CityName=A.CityName FOR XML PATH(‘‘)),1, 1, ‘‘) AS AFROM @T1 AGROUP BY CityName----第二种方式SELECT B.CityName,LEFT(UserList,LEN(UserList)-1) FROM (  SELECT CityName,(SELECT UserName+‘,‘ FROM @T1 WHERE CityName=A.CityName FOR XML PATH(‘‘)) AS UserList  FROM @T1 A   GROUP BY CityName     ) Bstuff(select ‘,‘ + fieldname  from tablename for xml path(‘‘)),1,1,‘‘)这一整句的作用是将多行fieldname字段的内容串联起来，用逗号分隔。for xml path是SQL Server 2005以后版本支持的一种生成XML的方式。stuff函数的作用是去掉字符串最前面的逗号分隔符。