create table ta(col1 int, col2 varchar(10))
insert ta select 1, 'A'
union all select 2, 'D'
union all select 1, 'B'
union all select 1, 'C'
union all select 2, 'E'
create function test_f(@col1 int)
returns varchar(100)
as
begin
declare @col2 varchar(100)
select @col2=isnull(@col2+',','')+col2 from ta where col1=@col1
return @col2
end
查询:
select distinct col1,dbo.test_f(col1) from ta
col1 col2
----------- ---------------
1 A,B,C
2 D,E
CREATE FUNCTION dbo.f_str(@col1 varchar(10))
RETURNS varchar(100)
AS
BEGIN
DECLARE @re varchar(100)
SET @re=''
SELECT @re=@re+','+CAST(col2 as varchar)
FROM tb
WHERE col1=@col1
RETURN(STUFF(@re,1,1,''))
END
GO
--调用函数
SELECT tb.col1,tb.col2=dbo.f_str(tb.col1) FROM (select col1,col2 from T1,T2 where t1.col=t2.col )tb GROUP BY tb.col1
--删除测试
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
GO
--合并处理函数
CREATE FUNCTION dbo.f_str(@col1 varchar(10))
RETURNS varchar(100)
AS
BEGIN
DECLARE @re varchar(100)
SET @re=''
SELECT @re=@re+','+CAST(col2 as varchar)
FROM tb
WHERE col1=@col1
RETURN(STUFF(@re,1,1,''))
END
GO
--调用函数
SELECT col1,col2=dbo.f_str(col1) FROM tb GROUP BY col1
--删除测试
DROP TABLE tb
DROP FUNCTION f_str
/*--结果
col1 col2
---------- -----------
a 1,2
b 1,2,3
--*/
GO