表中数据如下:
a b c d e
------------------------------------------------------------------------
17 11000004 1 19 Ablation for irregular heart beat
18 11000004 1 19 Endoscopic surgery for scoliosis想得到结果:
a b c d e
--------------------------------------------------------------------------
17 11000004 1 19,19 Ablation for irregular heart beat,Endoscopic surgery for scoliosis也就是说把B相同的两条纪录,删除其中一条,把D,E两个字段的值合并到一起,保存到d,e中。
a b c d e
------------------------------------------------------------------------
17 11000004 1 19 Ablation for irregular heart beat
18 11000004 1 19 Endoscopic surgery for scoliosis想得到结果:
a b c d e
--------------------------------------------------------------------------
17 11000004 1 19,19 Ablation for irregular heart beat,Endoscopic surgery for scoliosis也就是说把B相同的两条纪录,删除其中一条,把D,E两个字段的值合并到一起,保存到d,e中。
--处理的数据
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--合并处理
--定义结果集表变量
DECLARE @t TABLE(col1 varchar(10),col2 varchar(100))--定义游标并进行合并处理
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
--显示结果并删除测试数据
SELECT * FROM @t
DROP TABLE tb
/*--结果
col1 col2
---------- -----------
a 1,2
b 1,2,3
--*/
GO
/*==============================================*/
--3.3.2 使用用户定义函数,配合SELECT处理完成字符串合并处理的示例
--处理的数据
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/*==============================================*/
--3.3.3 使用临时表实现字符串合并处理的示例
--处理的数据
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--合并处理
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
/*--更新处理后的临时表
col1 col2
---------- -------------
a 1
a 1,2
b 1
b 1,2
b 1,2,3
--*/
--得到最终结果
SELECT col1,col2=MAX(col2) FROM #t GROUP BY col1
/*--结果
col1 col2
---------- -----------
a 1,2
b 1,2,3
--*/
--删除测试
DROP TABLE tb,#t
GO
/*==============================================*/--3.3.4.1 每组 <=2 条记录的合并
--处理的数据
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--合并处理
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
/*--结果
col1 col2
---------- ----------
a 1,2
b 1,2
c 3
--*/--3.3.4.2 每组 <=3 条记录的合并
--处理的数据
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--合并处理
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
/*--结果
col1 col2
---------- ------------
a 1,2
b 1,2,3
c 3
--*/
GO
http://topic.csdn.net/u/20080612/22/c850499f-bce3-4877-82d5-af2357857872.html
--> 生成测试数据: #T
if object_id('tempdb.dbo.#T') is not null drop table #T
create table #T (a int,b int,c int,d int,e varchar(50))
insert into #T
select 17,11000004,1,19,'Ablation for irregular heart beat' union all
select 18,11000004,1,19,'Endoscopic surgery for scoliosis'select min(a) a,
b,c,
stuff((select ','+ltrim(d) from #T where b=t.b and c=t.c for xml path('')),1,1,'') d,
stuff((select ','+e from #T where b=t.b and c=t.c for xml path('')),1,1,'') e
from #T t
group by b,c/*
a b c d e
----------- ----------- ----------- ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
17 11000004 1 19,19 Ablation for irregular heart beat,Endoscopic surgery for scoliosis(1 行受影响)*/
drop table Tab
Go
Create table Tab([Col1] int,[Col2] nvarchar(1))
Insert Tab
select 1,N'a' union all
select 1,N'b' union all
select 1,N'c' union all
select 2,N'd' union all
select 2,N'e' union all
select 3,N'f'
Gogo
if object_id('F_Str') is not null
drop function F_Str
go
create function F_Str(@Col1 int)
returns nvarchar(100)
as
begin
declare @S nvarchar(100)
select @S=isnull(@S+',','')+Col2 from Tab where Col1=@Col1
return @S
end
go
Select distinct Col1,Col2=dbo.F_Str(Col1) from Tabgo生成结果:
/*
Col1 COl2
----------- ------------
1 a,b,c
2 d,e
3 f(3 行受影响)
*/
INSERT TB SELECT 17,11000004,1,19,'Ablation for irregular heart beat'
UNION ALL SELECT 18,11000004,1,19,'Endoscopic surgery for scoliosis' CREATE FUNCTION F_UNION (@FIELD varchar(10),@V INT)
RETURNS VARCHAR(200)
AS
BEGIN
DECLARE @RE varchar(100)
SET @RE=''
SELECT @RE=@RE+','+CASE WHEN @V=0 THEN CAST(D as varchar) ELSE CAST(E as varchar) END
FROM TB
WHERE B=@FIELD
RETURN(STUFF(@RE,1,1,''))
END
GOSELECT TOP 1 A,B,C,D=dbo.F_UNION(B,0),E=dbo.F_UNION(B,1) FROM TB ORDER BY A /*
A B C D E
----------- ----------- ----------- ------------ ----------------------------------------------------------------
17 11000004 1 19,19 Ablation for irregular heart b,Endoscopic surgery for scolios(所影响的行数为 1 行)
*/
INSERT TB SELECT 17,11000004,1,19,'Ablation for irregular heart beat'
UNION ALL SELECT 18,11000004,1,19,'Endoscopic surgery for scoliosis' DECLARE @A VARCHAR(10)
DECLARE @B VARCHAR(80)SELECT @A=ISNULL(@A,'')+','+CONVERT(VARCHAR,D) FROM TB
SELECT @B=ISNULL(@B,'')+','+E FROM TBSELECT TOP 1 A,B,C,STUFF(@A,1,1,'')AS D,STUFF(@B,1,1,'')AS E FROM TB /*
A B C D E
----------- ----------- ----------- --------- -----------------------------------------------------------------------
17 11000004 1 19,19 Ablation for irregular heart beat,Endoscopic surgery for scoliosis(所影响的行数为 1 行)*/
create table tb(a int,b int,c int ,d int ,e varchar(300))insert into tb select 17,11000004, 1, 19, 'Ablation for irregular heart beat'
union all select 18, 11000004 ,1 ,19 ,'Endoscopic surgery for scoliosis'
CREATE FUNCTION dbo.f_str(@de char(1),@col1 int)
RETURNS varchar(1000)
AS
BEGIN
DECLARE @re varchar(100)
SET @re=''
SELECT @re=@re+','+ CASE @de WHEN 'd' THEN CAST(d as varchar) ELSE CAST(e as varchar) END
FROM tb
WHERE b=@col1
RETURN(STUFF(@re,1,1,''))
END
GOselect top 1 a,b,c,d=dbo.f_str('d',b),e=dbo.f_str('e',b) from tb
---这个存储过程可以提取包含任意个@字符的字符串,通过临时表输出,使用查询分析器或前台数据集都可以得到结果。 create procedure decord_A
@STR VARCHAR(100)
AS
declare @n int,@SN INT
SET @N=LEN(@STR)-LEN(REPLACE(@STR,'@',''))--提取字符@的个数
SET @SN=1
CREATE table #TEMP(SN INT,CSTR VARCHAR(100))
WHILE @SN<=@N
BEGIN
INSERT INTO #TEMP SELECT @SN,LEFT(@STR,CHARINDEX('@',@STR)-1)
SELECT @SN=@SN+1,@STR=SUBSTRING(@STR,CHARINDEX('@',@STR)+1,100)
END
INSERT INTO #TEMP SELECT @N+1,@STR
SELECT *FROM #TEMP order by sn
GO
--处理的数据
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--合并处理
--定义结果集表变量
DECLARE @t TABLE(col1 varchar(10),col2 varchar(100))--定义游标并进行合并处理
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
--显示结果并删除测试数据
SELECT * FROM @t
DROP TABLE tb
/*--结果
col1 col2
---------- -----------
a 1,2
b 1,2,3
--*/
GO
/*==============================================*/
--3.3.2 使用用户定义函数,配合SELECT处理完成字符串合并处理的示例
--处理的数据
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/*==============================================*/
--3.3.3 使用临时表实现字符串合并处理的示例
--处理的数据
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--合并处理
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
/*--更新处理后的临时表
col1 col2
---------- -------------
a 1
a 1,2
b 1
b 1,2
b 1,2,3
--*/
--得到最终结果
SELECT col1,col2=MAX(col2) FROM #t GROUP BY col1
/*--结果
col1 col2
---------- -----------
a 1,2
b 1,2,3
--*/
--删除测试
DROP TABLE tb,#t
GO
/*==============================================*/--3.3.4.1 每组 <=2 条记录的合并
--处理的数据
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--合并处理
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
/*--结果
col1 col2
---------- ----------
a 1,2
b 1,2
c 3
--*/--3.3.4.2 每组 <=3 条记录的合并
--处理的数据
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--合并处理
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
/*--结果
col1 col2
---------- ------------
a 1,2
b 1,2,3
c 3
--*/
GO
drop table t
go
create TABLE t (A INT,B int,C INT,D INT,E VARCHAR(100) )
INSERT into t
SELECT 17,11000004,1,19,'Ablation for irregular heart beat'
UNION ALL
SELECT 18,11000004,1,19,'Endoscopic surgery for scoliosis'
UNION ALL
SELECT 19,11000005,1,20,'11111111111'
UNION ALL
SELECT 20,11000005,1,20,'22222222222'
goif object_id('temp') is not null
drop table temp
go
select t1.A [A], t1.B [B], t1.C [C], t1.D [D],
convert(varchar(20),t2.D)+' '+t1.E+' '+t2.E [E] into [temp] from t t1
left join t t2 on(t2.[B]=t1.[B])
where t2.A>t1.Adrop table texec sp_rename temp, tselect * from t
set nocount on;
if not object_id('T') is null
drop table T
Go
set nocount on;
Create table T([a] int,[b] int,[c] int,[d] int,[e] nvarchar(33))
Insert T
select 17,11000004,1,19,N'Ablation for irregular heart beat' union all
select 18,11000004,1,19,N'Endoscopic surgery for scoliosis'
Go
if not object_id('F_str') is null
drop function F_str
go
create function F_str(@b int,@c int)
returns nvarchar(200)
as
begin
declare @s nvarchar(200),@s2 nvarchar(200)
Select @s=isnull(@s+',','')+rtrim([d]),@s2=isnull(@s2+',','')+[e] from T where [b]=@b and [c]=@c
return (@s+' '+@s2)
end
go
select min([a])[a],[b],[c],dbo.F_str([b],[c])[e] from t group by [b],[c]/*
a b c e
----------- ----------- ----------- --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
17 11000004 1 19,19 Ablation for irregular heart beat,Endoscopic surgery for scoliosis
*/
--> --> (Roy)生成測試數據
set nocount on;
if not object_id('T') is null
drop table T
Go
set nocount on;
Create table T([a] int,[b] int,[c] int,[d] int,[e] nvarchar(33))
Insert T
select 17,11000004,1,19,N'Ablation for irregular heart beat' union all
select 18,11000004,1,19,N'Endoscopic surgery for scoliosis'
Go
select
a.*,
[e]=STUFF(b.Col.query('(/d/text())').value('.', 'nvarchar(max)'), 1, 1, N'')+' '
+STUFF(b.Col.query('(/e/text())').value('.', 'nvarchar(max)'), 1, 1, N'')
from
(select distinct min([a])[a],[b],[c] from T group by [b],[c]) a
Cross apply
(select Col=(select [d]=N','+rtrim([d]),[e]=N','+[e] from T where [b]=a.[b] and [c]=a.[c] For XML PATH(''), TYPE))ba b c e
----------- ----------- ----------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
17 11000004 1 19,19 Ablation for irregular heart beat,Endoscopic surgery for scoliosis