1 一.定义表变量 2 3 DECLARE @T1 table 4 ( 5 UserID int , 6 UserName nvarchar(50), 7 CityName nvarchar(50) 8 ); 9 10 insert into @T1 (UserID,UserName,CityName) values (1,'a','上海') 11 insert into @T1 (UserID,UserName,CityName) values (2,'b','北京') 12 insert into @T1 (UserID,UserName,CityName) values (3,'c','上海') 13 insert into @T1 (UserID,UserName,CityName) values (4,'d','北京') 14 insert into @T1 (UserID,UserName,CityName) values (5,'e','上海') 15 16 select * from @T1 17 18 -----最优的方式 19 SELECT CityName,STUFF((SELECT ',' + UserName FROM @T1 subTitle WHERE CityName=A.CityName FOR XML PATH('')),1, 1, '') AS A 20 FROM @T1 A 21 GROUP BY CityName 22 23 ----第二种方式 24 SELECT B.CityName,LEFT(UserList,LEN(UserList)-1) 25 FROM ( 26 SELECT CityName,(SELECT UserName+',' FROM @T1 WHERE CityName=A.CityName FOR XML PATH('')) AS UserList 27 FROM @T1 A 28 GROUP BY CityName 29 ) B 30 31 stuff(select ',' + fieldname from tablename for xml path('')),1,1,'') 32 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。 33 34 for xml path是SQL Server 2005以后版本支持的一种生成XML的方式。 35 36 stuff函数的作用是去掉字符串最前面的逗号分隔符。