SQL 列转行，即多行合并成一条

CREATE TABLE [t2]([NID] [bigint] NULL,[district] [nvarchar](255) NULL,[town] [nvarchar](255) NULL);
insert into t2 values(1,'淮上区','曹老集镇');
insert into t2 values(2,'淮上区','淮滨街道');
insert into t2 values(3,'淮上区','梅桥乡');
insert into t2 values(4,'淮上区','吴小街镇');
insert into t2 values(5,'淮上区','小蚌埠镇');
insert into t2 values(1,'光明新区','公明街道');
insert into t2 values(2,'光明新区','光明街道');
insert into t2 values(1,'吉利区','大庆路街道');
insert into t2 values(2,'吉利区','吉利乡');

CREATE FUNCTION dbo.townconcat(@district nvarchar(255)) 
RETURNS varchar(8000) 
AS 
BEGIN 
    DECLARE @str varchar(8000) 
    SET @str = '' 
    SELECT @str = @str + ',' + town FROM t2 WHERE [email protected] 
    RETURN STUFF(@str, 1, 1, '') 
END 
GO 
-- 调用函数 
SELECt district, town = dbo.townconcat(district) FROM t2 GROUP BY district 

drop function dbo.townconcat
go

--将2000版中的
SELECT @str = @str + ',' + town FROM t2 WHERE [email protected]
--变成
SELECT @str = concat(@str,',',town) FROM t2 WHERE [email protected] 

其他代码不变

select distinct a.district,
(SELECT town+','FROM t2 where district=a.district FOR XML PATH(''))as towns 
from t2 a

SELECT town+','FROM t2  FOR XML PATH('')