先拆分表,然后去重复,然后合并表.拆分表:CREATE TABLE A(id INT,country VARCHAR(100)) INSERT A SELECT 1,'中国;日本;韩国' UNION ALL SELECT 2,'美国;意大利;法国' UNION ALL SELECT 3,'德国' SELECT * FROM A-- 建立一个辅助的临时表就可以了 SELECT TOP 8000 id = identity(int,1,1) INTO # FROM syscolumns a, syscolumns b SELECT A.ID, COUNTRY = SUBSTRING(A.COUNTRY, B.ID, CHARINDEX(';', A.COUNTRY + ';', B.ID) - B.ID) FROM A, # B WHERE SUBSTRING(';' + a.COUNTRY, B.id, 1) = ';' ORDER BY 1,2 GODROP TABLE A,#id country ----------- ---------------- 1 中国;日本;韩国 2 美国;意大利;法国 3 德国(所影响的行数为 3 行)ID COUNTRY ----------- --------- 1 韩国 1 日本 1 中国 2 法国 2 美国 2 意大利 3 德国(所影响的行数为 7 行)去重复:这里不说了.合并表--带符号合并行列转换--有表t,其数据如下: a b 1 1 1 2 1 3 2 1 2 2 3 1 --如何转换成如下结果: a b 1 1,2,3 2 1,2 3 1 create table tb ( a int, b int ) insert into tb(a,b) values(1,1) insert into tb(a,b) values(1,2) insert into tb(a,b) values(1,3) insert into tb(a,b) values(2,1) insert into tb(a,b) values(2,2) insert into tb(a,b) values(3,1) goif object_id('pubs..f_hb') is not null drop function f_hb go--创建一个合并的函数 create function f_hb(@a int) returns varchar(8000) as begin declare @str varchar(8000) set @str = '' select @str = @str + ',' + cast(b as varchar) from tb where a = @a set @str = right(@str , len(@str) - 1) return(@str) End go--调用自定义函数得到结果: select distinct a ,dbo.f_hb(a) as b from tbdrop table tb--结果 a b ----------- ------ 1 1,2,3 2 1,2 3 1(所影响的行数为 3 行)
CREATE TABLE A(f1 char(10),f2 VARCHAR(100)) INSERT A select 'A', 'x,y,z' union all select 'A', 'y,z,p' union all select 'B', 'x,y' union all select 'B', 'x,z' union all select 'C', 'e,x' union all select 'C', 'e,d' select * from aselect top 1000 id=identity(int,1,1) into # from syscolumns a,syscolumns bselect DISTINCT case A.f1 when 'A' then 1 when 'B' THEN 2 ELSE 3 END AS F1 ,F2=SUBSTRING(A.F2,B.ID,CHARINDEX(',',A.F2+',',B.ID)-B.ID)INTO T FROM A A ,# B WHERE SUBSTRING(','+A.F2,B.ID,1)=',' GROUP BY F1,F2,B.ID ORDER BY F1ALTER FUNCTION UNION_HB(@A CHAR(10) ) RETURNS VARCHAR(8000) AS BEGIN DECLARE @STR VARCHAR(1000) SET @STR='' SELECT @STR=@STR+','+F2 FROM T WHERE F1=@A SET @STR=STUFF(@STR,1,1,'') RETURN @STR END SELECT DISTINCT CASE F1 WHEN '1'THEN 'A' WHEN '2' THEN 'B' ELSE 'C' END AS F1,DBO.UNION_HB(F1) AS F2 FROM T
A,x,y,z,p B,x,y,z C,e,x,d
楼上的方法也是太过局限(when 'A ' then 1 when 'B ' THEN 2 ELSE 3 ),不过很有创意.大家还有什么好方法.
create table a(F1 varchar(100) , F2 varchar(100)) insert a select 'A', 'x,y,z' union all select 'A' ,'y,z,p' union all select 'B' ,'x,y' union all select 'B' ,'x,z' union all select 'C' ,'e,x' union all select 'C' ,'e,d' go create function getAA(@f1 varchar(100)) returns varchar(1000) as begin declare @sql varchar(1000) select @sql=isnull(@sql+',','') +f2 from a where f1=@f1 return @sql end go create function getBB(@f2 varchar(1000)) returns varchar(1000) as begin declare @a table(id int identity(1,1),b int) declare @b table(a varchar(1000),id int) declare @sql varchar(1000) insert @a select top 100 1 from syscolumns a ,syscolumns b insert @b select substring(@f2+',',id,charindex(',',@f2+',',id)-id) x,id from @a where substring(','+@f2,id,1)=',' order by id select @sql=isnull(@sql+',','')+a from (select * from @b b where not exists (select 1 from @b where a=b.a and id<b.id))bb return @sql end go select f1, dbo.getBB(dbo.getAA(f1)) value from a group by f1
--result /* f1 value ---------- ---------- A x,y,z,p B x,y,z C e,x,d(所影响的行数为 3 行) */
TO楼上的:(树上的鸟儿): 我测试,返回值为: A x,y,z , ,z , , y,z,p , ,p B x,y , , x,z C e,x , , e,d
INSERT A
SELECT 1,'中国;日本;韩国' UNION ALL
SELECT 2,'美国;意大利;法国' UNION ALL
SELECT 3,'德国'
SELECT * FROM A-- 建立一个辅助的临时表就可以了
SELECT TOP 8000 id = identity(int,1,1)
INTO # FROM syscolumns a, syscolumns b
SELECT
A.ID,
COUNTRY = SUBSTRING(A.COUNTRY, B.ID, CHARINDEX(';', A.COUNTRY + ';', B.ID) - B.ID)
FROM A, # B
WHERE SUBSTRING(';' + a.COUNTRY, B.id, 1) = ';'
ORDER BY 1,2
GODROP TABLE A,#id country
----------- ----------------
1 中国;日本;韩国
2 美国;意大利;法国
3 德国(所影响的行数为 3 行)ID COUNTRY
----------- ---------
1 韩国
1 日本
1 中国
2 法国
2 美国
2 意大利
3 德国(所影响的行数为 7 行)去重复:这里不说了.合并表--带符号合并行列转换--有表t,其数据如下:
a b
1 1
1 2
1 3
2 1
2 2
3 1
--如何转换成如下结果:
a b
1 1,2,3
2 1,2
3 1 create table tb
(
a int,
b int
)
insert into tb(a,b) values(1,1)
insert into tb(a,b) values(1,2)
insert into tb(a,b) values(1,3)
insert into tb(a,b) values(2,1)
insert into tb(a,b) values(2,2)
insert into tb(a,b) values(3,1)
goif object_id('pubs..f_hb') is not null
drop function f_hb
go--创建一个合并的函数
create function f_hb(@a int)
returns varchar(8000)
as
begin
declare @str varchar(8000)
set @str = ''
select @str = @str + ',' + cast(b as varchar) from tb where a = @a
set @str = right(@str , len(@str) - 1)
return(@str)
End
go--调用自定义函数得到结果:
select distinct a ,dbo.f_hb(a) as b from tbdrop table tb--结果
a b
----------- ------
1 1,2,3
2 1,2
3 1(所影响的行数为 3 行)
INSERT A
select 'A', 'x,y,z' union all
select 'A', 'y,z,p' union all
select 'B', 'x,y' union all
select 'B', 'x,z' union all
select 'C', 'e,x' union all
select 'C', 'e,d'
select * from aselect top 1000 id=identity(int,1,1) into # from syscolumns a,syscolumns bselect DISTINCT case A.f1 when 'A' then 1 when 'B' THEN 2 ELSE 3 END AS F1 ,F2=SUBSTRING(A.F2,B.ID,CHARINDEX(',',A.F2+',',B.ID)-B.ID)INTO T FROM A A ,# B
WHERE SUBSTRING(','+A.F2,B.ID,1)=',' GROUP BY F1,F2,B.ID ORDER BY F1ALTER FUNCTION UNION_HB(@A CHAR(10) )
RETURNS VARCHAR(8000)
AS
BEGIN
DECLARE @STR VARCHAR(1000)
SET @STR=''
SELECT @STR=@STR+','+F2 FROM T WHERE F1=@A
SET @STR=STUFF(@STR,1,1,'')
RETURN @STR
END
SELECT DISTINCT CASE F1 WHEN '1'THEN 'A' WHEN '2' THEN 'B' ELSE 'C' END AS F1,DBO.UNION_HB(F1) AS F2 FROM T
B,x,y,z
C,e,x,d
insert a select 'A', 'x,y,z'
union all select 'A' ,'y,z,p'
union all select 'B' ,'x,y'
union all select 'B' ,'x,z'
union all select 'C' ,'e,x'
union all select 'C' ,'e,d'
go
create function getAA(@f1 varchar(100))
returns varchar(1000)
as
begin
declare @sql varchar(1000)
select @sql=isnull(@sql+',','') +f2 from a where f1=@f1
return @sql
end
go
create function getBB(@f2 varchar(1000))
returns varchar(1000)
as
begin
declare @a table(id int identity(1,1),b int)
declare @b table(a varchar(1000),id int)
declare @sql varchar(1000) insert @a select top 100 1 from syscolumns a ,syscolumns b
insert @b select substring(@f2+',',id,charindex(',',@f2+',',id)-id) x,id
from @a
where substring(','+@f2,id,1)=',' order by id
select @sql=isnull(@sql+',','')+a from (select * from @b b where not exists (select 1 from @b where a=b.a and id<b.id))bb
return @sql
end
go
select f1, dbo.getBB(dbo.getAA(f1)) value from a group by f1
/*
f1 value
---------- ----------
A x,y,z,p
B x,y,z
C e,x,d(所影响的行数为 3 行)
*/
我测试,返回值为:
A x,y,z , ,z , , y,z,p , ,p
B x,y , , x,z
C e,x , , e,d