如一条记录:OrderNo Area Money EmpIDN00100620001 1453.583 789213.00 3,13,21
N00100620002 753.583 339221.00 13,17
要变成以下形式:N00100620001 1453.583 789213.00 3
N00100620001 1453.583 789213.00 13
N00100620001 1453.583 789213.00 21
N00100620002 753.583 339221.00 13
N00100620002 753.583 339221.00 17求高手在线解答,上一次有看到一个函数,好像运行速度很慢,求效率点的解决方法...上分分
N00100620002 753.583 339221.00 13,17
要变成以下形式:N00100620001 1453.583 789213.00 3
N00100620001 1453.583 789213.00 13
N00100620001 1453.583 789213.00 21
N00100620002 753.583 339221.00 13
N00100620002 753.583 339221.00 17求高手在线解答,上一次有看到一个函数,好像运行速度很慢,求效率点的解决方法...上分分
IF OBJECT_ID('[tb]') IS NOT NULL
DROP TABLE [tb]
GO
CREATE TABLE [tb] ([OrderNo] [nvarchar](20),[Area] [numeric](7,3),[Money] [numeric](8,2),[EmpID] [nvarchar](10))
INSERT INTO [tb]
SELECT 'N00100620001','1453.583','789213.00','3,13,21' UNION ALL
SELECT 'N00100620002','753.583','339221.00','13,17'--SELECT * FROM [tb]-->SQL查询如下:
SELECT [OrderNo],[Area],[Money], b.[EmpID]
FROM (
SELECT [OrderNo],[Area],[Money], [EmpID] = CONVERT(XML, '<v>'+REPLACE([EmpID], ',', '</v><v>')+'</v>')
FROM tb
) a
OUTER APPLY(
SELECT [EmpID] = n.v.value('.', 'int')
FROM a.[EmpID].nodes('/v') n(v)
) b
/*
OrderNo Area Money EmpID
-------------------- --------------------------------------- --------------------------------------- -----------
N00100620001 1453.583 789213.00 3
N00100620001 1453.583 789213.00 13
N00100620001 1453.583 789213.00 21
N00100620002 753.583 339221.00 13
N00100620002 753.583 339221.00 17(5 行受影响)
*/
--合并分拆表
/******************************************************************************************************************************************************
合并分拆表数据整理人:中国风(Roy)日期:2008.06.06
******************************************************************************************************************************************************/--> --> (Roy)生成測試數據
if not object_id('Tab') is null
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'
Go合并表:SQL2000用函数:go
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 TabgoSQL2005用XML:方法1:select
a.Col1,Col2=stuff(b.Col2.value('/R[1]','nvarchar(max)'),1,1,'')
from
(select distinct COl1 from Tab) a
Cross apply
(select COl2=(select N','+Col2 from Tab where Col1=a.COl1 For XML PATH(''), ROOT('R'), TYPE))b方法2:select
a.Col1,COl2=replace(b.Col2.value('/Tab[1]','nvarchar(max)'),char(44)+char(32),char(44))
from
(select distinct COl1 from Tab) a
cross apply
(select Col2=(select COl2 from Tab where COl1=a.COl1 FOR XML AUTO, TYPE)
.query('<Tab>
{for $i in /Tab[position()<last()]/@COl2 return concat(string($i),",")}
{concat("",string(/Tab[last()]/@COl2))}
</Tab>')
)bSQL05用CTE:;with roy as(select Col1,Col2,row=row_number()over(partition by COl1 order by COl1) from Tab)
,Roy2 as
(select COl1,cast(COl2 as nvarchar(100))COl2,row from Roy where row=1
union all
select a.Col1,cast(b.COl2+','+a.COl2 as nvarchar(100)),a.row from Roy a join Roy2 b on a.COl1=b.COl1 and a.row=b.row+1)
select Col1,Col2 from Roy2 a where row=(select max(row) from roy where Col1=a.COl1) order by Col1 option (MAXRECURSION 0)
生成结果:
/*
Col1 COl2
----------- ------------
1 a,b,c
2 d,e
3 f(3 行受影响)
*/
拆分表:--> --> (Roy)生成測試數據
if not object_id('Tab') is null
drop table Tab
Go
Create table Tab([Col1] int,[COl2] nvarchar(5))
Insert Tab
select 1,N'a,b,c' union all
select 2,N'd,e' union all
select 3,N'f'
GoSQL2000用辅助表:
if object_id('Tempdb..#Num') is not null
drop table #Num
go
select top 100 ID=Identity(int,1,1) into #Num from syscolumns a,syscolumns b
Select
a.Col1,COl2=substring(a.Col2,b.ID,charindex(',',a.Col2+',',b.ID)-b.ID)
from
Tab a,#Num b
where
charindex(',',','+a.Col2,b.ID)=b.ID --也可用 substring(','+a.COl2,b.ID,1)=','
SQL2005用Xml:select
a.COl1,b.Col2
from
(select Col1,COl2=convert(xml,'<root><v>'+replace(COl2,',','</v><v>')+'</v></root>') from Tab)a
outer apply
(select Col2=C.v.value('.','nvarchar(100)') from a.COl2.nodes('/root/v')C(v))b
SQL05用CTE:;with roy as
(select Col1,COl2=cast(left(Col2,charindex(',',Col2+',')-1) as nvarchar(100)),Split=cast(stuff(COl2+',',1,charindex(',',Col2+','),'') as nvarchar(100)) from Tab
union all
select Col1,COl2=cast(left(Split,charindex(',',Split)-1) as nvarchar(100)),Split= cast(stuff(Split,1,charindex(',',Split),'') as nvarchar(100)) from Roy where split>''
)
select COl1,COl2 from roy order by COl1 option (MAXRECURSION 0)生成结果:
/*
Col1 COl2
----------- -----
1 a
1 b
1 c
2 d
2 e
3 f
*/
-- Author: happy flystone
-- Version:V1.001
-- Date:2010-06-20
-------------------------------------- Test Data: news
If object_id('news') is not null
Drop table news
Go
Create table news(OrderNo nvarchar(12),Area numeric(7,3),Money numeric(8,2),EmpID varchar(100))
Go
Insert into news
select 'N00100620001',1453.583,789213.00,'3,13,21' union all
select 'N00100620002',753.583,339221.00,'13,17'
Go
--Start
Select OrderNo ,Area ,[Money] ,substring(empid,b.n,charindex(',',empid+',',b.n)-b.n)
--substring(empid,n,charindex(',',empid+',',n+1) - n )
from news a,(select number as n from master..spt_values where type = 'P') b
where substring(','+empid,n,1)=','
--Result:
/*OrderNo Area Money
------------ --------- ---------- ------------------------------
N00100620001 1453.583 789213.00 3
N00100620001 1453.583 789213.00 13
N00100620001 1453.583 789213.00 21
N00100620002 753.583 339221.00 13
N00100620002 753.583 339221.00 17(所影响的行数为 5 行)*/
--End
[/code]
id value
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
欲按id,分拆value列, 分拆后结果如下:
id value
----------- --------
1 aa
1 bb
2 aaa
2 bbb
2 ccc 1. 旧的解决方法(sql server 2000)
SELECT TOP 8000 id = IDENTITY(int, 1, 1) INTO # FROM syscolumns a, syscolumns b SELECT A.id, SUBSTRING(A.[values], B.id, CHARINDEX(',', A.[values] + ',', B.id) - B.id)
FROM tb A, # B
WHERE SUBSTRING(',' + A.[values], B.id, 1) = ',' DROP TABLE # 2. 新的解决方法(sql server 2005) create table tb(id int,value varchar(30))
insert into tb values(1,'aa,bb')
insert into tb values(2,'aaa,bbb,ccc')
go
SELECT A.id, B.value
FROM(
SELECT id, [value] = CONVERT(xml,' <root> <v>' + REPLACE([value], ',', ' </v> <v>') + ' </v> </root>') FROM tb
)A
OUTER APPLY(
SELECT value = N.v.value('.', 'varchar(100)') FROM A.[value].nodes('/root/v') N(v)
)B DROP TABLE tb /*
id value
----------- ------------------------------
1 aa
1 bb
2 aaa
2 bbb
2 ccc (5 行受影响)
*/