--和行转列的应用效果差不多了，统计结果中可能会用到
--测试表
create table Test
(F1 varchar(10),
F2 varchar(10))
--插入数据
insert into Test
select 'jack' F1,'book1' F2
union
select 'jack' F1,'book2' F2
union
select 'jack' F1,'book3' F2
union
select 'Mary' F1,'book4' F2
union
select 'Mary' F1,'book5' F2
union
select 'Mike' F1,'book1' F2
union
select 'Mike' F1,'book5' F2
union
select 'Mike' F1,'book7' F2
union
select 'Mike' F1,'book9' F2
--一条动态SQL语句
go
--合并函数
CREATE FUNCTION MergeCharField(@Group varchar(255))
RETURNS varchar(8000)
AS
BEGIN
DECLARE @r varchar(8000)
SET @r=''
SELECT @r=@r+','+rtrim(F2) FROM Test WHERE F1=@Group
RETURN(substring(@r,2,8000))
END
GO
--调用
select F1 [name],dbo.MergeCharField(F1) [book] from test group by F1
--删除测试环境
drop table test
drop FUNCTION MergeCharField
/*
name book
--------------------------
jack book1,book2,book3
Mary book4,book5
Mike book1,book5,book7,book9
*/
