合并分拆表_整理贴1
--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 TabGoCreate table Tab([Col1] int,[Col2] nvarchar(1))Insert Tabselect 1,N'a' union allselect 1,N'b' union allselect 1,N'c' union allselect 2,N'd' union allselect 2,N'e' union allselect 3,N'f'Go合并表:SQL2000用函数:goif object_id('F_Str') is not null drop function F_Strgocreate function F_Str(@Col1 int)returns nvarchar(100)asbegin declare @S nvarchar(100) select @S=isnull(@S+',','')+Col2 from Tab where Col1=@Col1 return @SendgoSelect 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) aCross 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) across 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,c2 d,e3 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 TabGoCreate table Tab([Col1] int,[COl2] nvarchar(5))Insert Tabselect 1,N'a,b,c' union allselect 2,N'd,e' union allselect 3,N'f'GoSQL2000用辅助表:if object_id('Tempdb..#Num') is not null drop table #Numgoselect top 100 ID=Identity(int,1,1) into #Num from syscolumns a,syscolumns bSelect a.Col1,COl2=substring(a.Col2,b.ID,charindex(',',a.Col2+',',b.ID)-b.ID) from Tab a,#Num bwhere charindex(',',','+a.Col2,b.ID)=b.ID --也可用 substring(','+a.COl2,b.ID,1)=','SQL2005用Xml:select a.COl1,b.Col2from (select Col1,COl2=convert(xml,'<root><v>'+replace(COl2,',','</v><v>')+'</v></root>') from Tab)aouter apply (select Col2=C.v.value('.','nvarchar(100)') from a.COl2.nodes('/root/v')C(v))bSQL05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 Tabunion allselect 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 a1 b1 c2 d2 e3 f*/
-- =============================================================================-- Title: 在SQL中分类合并数据行-- Author: dobear Mail(MSN): dobear_0922@hotmail.com-- Environment: Vista + SQL2005-- Date: 2008-04-22-- =============================================================================--1. 创建表，添加测试数据CREATE TABLE tb(id int, [value] varchar(10))INSERT tb 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 tb/**//*id value----------- ----------1 aa1 bb2 aaa2 bbb2 ccc(5 row(s) affected)*/--2 在SQL2000只能用自定义函数实现----2.1 创建合并函数fn_strSum，根据id合并value值GOCREATE FUNCTION dbo.fn_strSum(@id int)RETURNS varchar(8000)ASBEGIN DECLARE @values varchar(8000) SET @values = '' SELECT @values = @values + ',' + value FROM tb WHERE id=@id RETURN STUFF(@values, 1, 1, '')ENDGO-- 调用函数SELECT id, VALUE = dbo.fn_strSum(id) FROM tb GROUP BY idDROP FUNCTION dbo.fn_strSum----2.2 创建合并函数fn_strSum2，根据id合并value值GOCREATE FUNCTION dbo.fn_strSum2(@id int)RETURNS varchar(8000)ASBEGIN DECLARE @values varchar(8000) SELECT @values = isnull(@values + ',', '') + value FROM tb WHERE id=@id RETURN @valuesENDGO-- 调用函数SELECT id, VALUE = dbo.fn_strSum2(id) FROM tb GROUP BY idDROP FUNCTION dbo.fn_strSum2--3 在SQL2005中的新解法----3.1 使用OUTER APPLYSELECT * 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----3.2 使用XMLSELECT id, [values]=STUFF((SELECT ','+[value] FROM tb t WHERE id=tb.id FOR XML PATH('')), 1, 1, '')FROM tbGROUP BY id--4 删除测试表tbdrop table tb/**//*id values----------- --------------------1 aa,bb2 aaa,bbb,ccc(2 row(s) affected)*/
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参考：SQL中合并多行记录的方法总汇
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学习
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学习 ~
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例子而已，不需要深究。
一个解决问题不错方法.......
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学习！
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学习!
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接分，学习！
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学习.
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悟空,看看。。。
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使用的是游标和循环截取法declare @tb table(id int identity(1,1),name char(50))insert @tb select'jame,job'insert @tb select 'carl,mc'insert @tb select 'paul'declare c1 cursor for select name from @tbdeclare @tmp table(id int identity(1,1),name char(50))declare @s char(50)open c1fetch c1 into @swhile(@@fetch_status = 0)begin while charindex(',',@s)>0 begin insert into @tmp values(left(@s,charindex(',',@s)-1)) set @s=stuff(@s,1,charindex(',',@s),'') endINSERT @tmp VALUES(@s)fetch next from c1 into @sendselect * from @tmpclose c1deallocate c1动态sql法declare @tb table(id int identity(1,1),name char(50))insert @tb select'jame,job'insert @tb select 'carl,mc'insert @tb select 'paul'declare c1 cursor for select name from @tbdeclare @s char(50)declare @sql char(8000)open c1fetch c1 into @swhile(@@fetch_status = 0)begin set @sql='select '''+replace(@s,',',''' union all select ''')+'''' insert tmp exec(@sql) fetch next from c1 into @sendselect * from tmpclose c1deallocate c1
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mark
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只是不敢作案.
^_^
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学习~
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学习，备用！
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