a
name num
aa 1
bb 2
cc 4
dd 4
ee 2
:
name
aa,bb,cc,dd,ee
DECLARE @STR VARCHAR(8000)
SELECT @STR=ISNULL(@STR+',','')+name FROM (SELECT DISTINCT NAME FROM A)AS T
SELECT @STR
：
sql 2000， sql 2005 , ，
， ， ：
tb, ：
id value
1 aa
1 bb
2 aaa
2 bbb
2 ccc
：
id values
1 aa,bb
2 aaa,bbb,ccc
，group by id, value （ ）
1.
-- 1.
CREATE FUNCTION dbo.f_str(@id int)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @r varchar(8000)
SET @r = ''
SELECT @r = @r + ',' + value
FROM tb
WHERE id=@id
RETURN STUFF(@r, 1, 1, '')
END
GO
--
SELECt id, values=dbo.f_str(id)
FROM tb
GROUP BY id
-- 2.
--
DECLARE @t TABLE(id int, value varchar(10))
INSERT @t SELECT 1, 'aa'
UNION ALL SELECT 1, 'bb'
UNION ALL SELECT 2, 'aaa'
UNION ALL SELECT 2, 'bbb'
UNION ALL SELECT 2, 'ccc'
--
SELECT *FROM (SELECT DISTINCT Id FROM @t)A
OUTER APPLY(
SELECT [values]= STUFF(REPLACE(REPLACE(
( SELECT value FROM @t N
WHERE id = A.id
FOR XML AUTO
), '<N value="', ','), '"/>', ''), 1, 1, '')
)N
/*--
id values
----------- ----------------
1 aa,bb
2 aaa,bbb,ccc
(2 )
--*/
--
--3.3.1 。
--
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
--
--
DECLARE @t TABLE(col1 varchar(10),col2 varchar(100))
--
DECLARE tb CURSOR LOCAL
FOR
SELECT col1,col2 FROM tb ORDER BY col1,col2
DECLARE @col1_old varchar(10),@col1 varchar(10),@col2 int,@s varchar(100)
OPEN tb
FETCH tb INTO @col1,@col2
SELECT @col1_old=@col1,@s=''
WHILE @@FETCH_STATUS=0
BEGIN
IF @col1=@col1_old
SELECT @s=@s+','+CAST(@col2 as varchar)
ELSE
BEGIN
INSERT @t VALUES(@col1_old,STUFF(@s,1,1,''))
SELECT @s=','+CAST(@col2 as varchar),@col1_old=@col1
END
FETCH tb INTO @col1,@col2
END
INSERT @t VALUES(@col1_old,STUFF(@s,1,1,''))
CLOSE tb
DEALLOCATE tb
--
SELECT * FROM @t
DROP TABLE tb
/*--
col1 col2
a 1,2
b 1,2,3
--*/
GO
--3.3.2 ， SELECT
--
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
--
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
--
SELECT col1,col2=dbo.f_str(col1) FROM tb GROUP BY col1
--
DROP TABLE tb
DROP FUNCTION f_str
/*--
col1 col2
a 1,2
b 1,2,3
--*/
GO
--3.3.3
--
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
--
SELECT col1,col2=CAST(col2 as varchar(100))
INTO #t FROM tb
ORDER BY col1,col2
DECLARE @col1 varchar(10),@col2 varchar(100)
UPDATE #t SET
@col2=CASE WHEN @col1=col1 THEN @col2+','+col2 ELSE col2 END,
@col1=col1,
col2=@col2
SELECT * FROM #t
/*--
col1 col2
a 1
a 1,2
b 1
b 1,2
b 1,2,3
--*/
--
SELECT col1,col2=MAX(col2) FROM #t GROUP BY col1
/*--
col1 col2
a 1,2
b 1,2,3
--*/
--
DROP TABLE tb,#t
GO
--3.3.4.1 <=2
--
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 'c',3
--
SELECT col1,
col2=CAST(MIN(col2) as varchar)
+CASE
WHEN COUNT(*)=1 THEN ''
ELSE ','+CAST(MAX(col2) as varchar)
END
FROM tb
GROUP BY col1
DROP TABLE tb
/*--
col1 col2
---------- ----------
a 1,2
b 1,2
c 3
--*/
--3.3.4.2 <=3
--
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
UNION ALL SELECT 'c',3
--
SELECT col1,
col2=CAST(MIN(col2) as varchar)
+CASE
WHEN COUNT(*)=3 THEN ','
+CAST((SELECT col2 FROM tb WHERE col1=a.col1 AND col2 NOT IN(MAX(a.col2),MIN(a.col2))) as varchar)
ELSE ''
END
+CASE
WHEN COUNT(*)>=2 THEN ','+CAST(MAX(col2) as varchar)
ELSE ''
END
FROM tb a
GROUP BY col1
DROP TABLE tb
/*--
col1 col2
---------- ------------
a 1,2
b 1,2,3
c 3
--*/
GO
if not object_id('A') is null
drop table A
Go
Create table A([id] int,[cname] nvarchar(2))
Insert A
select 1,N' ' union all
select 2,N' ' union all
select 3,N' ' union all
select 4,N' '
Go
--> -->
if not object_id('B') is null
drop table B
Go
Create table B([id] int,[cname] nvarchar(5))
Insert B
select 1,N'1,2,3' union all
select 2,N'3,4'
Go
create function F_str(@cname nvarchar(100))
returns nvarchar(100)
as
begin
select @cname=replace(@cname,ID,[cname]) from A where patindex('%,'+rtrim(ID)+',%',','+@cname+',')>0
return @cname
end
go
select [id],dbo.F_str([cname])[cname] from B
id cname
1 , ,
2 ,
(2 )
:a,b,c
.
:
:
id name
1 a
2 b
3 c
SQL ?
declare @str varchar(8000)
set @str = 'a1,b1,c2,d1,e3,f5'
set @str = 'select name='''+replace(@str,',',''''+' union all select ''')+''''
set @str='select id=identity(int,1,1),name into #temp from ('+@str+') a select * from #temp drop table #temp'
exec(@str)
-- :
CREATE TABLE TB(ID VARCHAR(6), COLOR NVARCHAR(30))
INSERT TB
SELECT '173160', N'# ,# ' UNION ALL
SELECT '173160', N'# ,# ' UNION ALL
SELECT '911169', N'# ,# ,# ,# ' UNION ALL
SELECT '911169', N'# ,# ,# ,# ' UNION ALL
SELECT '911169', N'# ,# ,# ,# ' UNION ALL
SELECT '911169', N'# ,# ,# ,# '
GO
CREATE FUNCTION F_getStr(@color nvarchar(30))
returns nvarchar(30)
as
begin
declare @str nvarchar(30),@temp nvarchar(30)
set @str=''
set @temp=''
while charindex(',', @color+',')>0
begin
set @temp=left(@color, charindex(',', @color+',')-1)
if charindex(','+@temp+',', ','+@str+',')=0
set @str=@str+','+@temp
set @color=stuff(@color, 1, charindex(',', @color+','), '')
end
return stuff(@str, 1, 1, '')
end
go
SELECT ID,dbo.F_getStr(COLOR) as COLOR FROM TB
DROP TABLE TB
DROP FUNCTION F_getStr
/*
ID COLOR
173160 #
173160 #
911169 # ,#
911169 # ,#
911169 # ,#
911169 # ,#
*/