原始表:
A1 A2 A3 A4 A5
923 NC AH SG, NC NC
923 NC BO NC, TR NC
a01 NC AH NC TS, AU
a01 NC BO TR NC, US
a0K NC BO US TM, UB
aU1 NC AH TR BW, US
aU1 NC BO DK NC, UE规则:A1列是唯一的, 相同的A1列值则合并A4,A5列, 并且A4,A5列按字母顺序排列,无重复值结果表:
A1 A2 A4 A5
923 NC TR, SG, NC NC
a01 NC TR, NC AU, TS, NC, US
a0K NC US TM, UB
aU1 NC TR, DK BW, NC, UE, US
A1 A2 A3 A4 A5
923 NC AH SG, NC NC
923 NC BO NC, TR NC
a01 NC AH NC TS, AU
a01 NC BO TR NC, US
a0K NC BO US TM, UB
aU1 NC AH TR BW, US
aU1 NC BO DK NC, UE规则:A1列是唯一的, 相同的A1列值则合并A4,A5列, 并且A4,A5列按字母顺序排列,无重复值结果表:
A1 A2 A4 A5
923 NC TR, SG, NC NC
a01 NC TR, NC AU, TS, NC, US
a0K NC US TM, UB
aU1 NC TR, DK BW, NC, UE, US
A4=stuff((select ','+A4 from tb where A1=a.A1 and A2=a.A2 group by A4
order by A4 for xml path('')),1,1,''),
A5=stuff((select ','+A5 from tb where A1=a.A1 and A2=a.A2 group by A5
order by A5 for xml path('')),1,1,'')
from tb a group by A1,A2
--*******************************************************************************************
表结构,数据如下:
id value
----- ------
1 aa
1 bb
2 aaa
2 bbb
2 ccc 需要得到结果:
id values
------ -----------
1 aa,bb
2 aaa,bbb,ccc
即:group by id, 求 value 的和(字符串相加) 1. 旧的解决方法(在sql server 2000中只能用函数解决。)
--=============================================================================
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go
--1. 创建处理函数
CREATE FUNCTION dbo.f_strUnite(@id int)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @str varchar(8000)
SET @str = ''
SELECT @str = @str + ',' + value FROM tb WHERE id=@id
RETURN STUFF(@str, 1, 1, '')
END
GO
-- 调用函数
SELECt id, value = dbo.f_strUnite(id) FROM tb GROUP BY id
drop table tb
drop function dbo.f_strUnite
go
/*
id value
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
(所影响的行数为 2 行)
*/
--===================================================================================
2. 新的解决方法(在sql server 2005中用OUTER APPLY等解决。)
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go
-- 查询处理
SELECT * FROM(SELECT DISTINCT id FROM tb)A OUTER APPLY(
SELECT [values]= STUFF(REPLACE(REPLACE(
(
SELECT value FROM tb N
WHERE id = A.id
FOR XML AUTO
), ' <N value="', ','), '"/>', ''), 1, 1, '')
)N
drop table tb /*
id values
----------- -----------
1 aa,bb
2 aaa,bbb,ccc (2 行受影响)
*/ --SQL2005中的方法2
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go select id, [values]=stuff((select ','+[value] from tb t where id=tb.id for xml path('')), 1, 1, '')
from tb
group by id /*
id values
----------- --------------------
1 aa,bb
2 aaa,bbb,ccc (2 row(s) affected) */
select '923','NC','AH','SG,NC','NC' union all
select '923','NC','BO','NC,TR','NC' union all
select 'a01','NC','AH','NC','TS,AU' union all
select 'a01','NC','BO','TR','NC,US' union all
select 'a0K','NC','BO','US','TM,UB' union all
select 'aU1','NC','AH','TR','BW,US' union all
select 'aU1','NC','BO','DK','NC,UE'
;with cte as
(
select ta.*,tb.A5 from
(
select distinct A1,A2,
substring(A4,a.number,charindex(',',A4+',',a.number)-a.number) as A4
from #tb,master..spt_values a
where a.type='p' and charindex(',',','+A4,a.number)=a.number
) ta ,
(
select distinct A1,A2,
substring(A5,a.number,charindex(',',A5+',',a.number)-a.number) as A5
from #tb,master..spt_values a
where a.type='p' and charindex(',',','+A5,a.number)=a.number
) tb where ta.A1=tb.A1 and ta.A2=tb.A2
)select A1,A2,
A4=stuff((select ','+ltrim(A4) from (select distinct A1,A4 from cte) b
where a.A1=b.A1 for xml path('')),1,1,''),
A5=stuff((select ','+ltrim(A5) from (select distinct A1,A5 from cte) b
where a.A1=b.A1 for xml path('')),1,1,'')
from cte a
group by A1,A2
order by A1,A2/*
A1 A2 A4 A5
----- ----- ----------------------------
923 NC NC,SG,TR NC
a01 NC NC,TR AU,NC,TS,US
a0K NC US TM,UB
aU1 NC DK,TR BW,NC,UE,US(4 行受影响)
*/