有两张表:表A与表B表A里一个字段("字段1")保存是表B多条记录的ID,用","隔开的,例如:'12,23,24,25'.现在需要将表A的该字段与指定的字符串相匹配.例如指定的字符串是:'25,26,27,28'.只要有一个隔开的值相等或完全相等,那么该条记录就是符合要求的.上面这个例子,他们的值不完全相等,只有一个隔开的值25相等.那么该条记录符合需求的.各位大哥帮我看看这条SQL怎么写?
调试欢乐多
set @s = '25,26,27,28'
exec('
select distinct a.*
from ta a
left join (select '+replace(@s,',',' as n union all select ')+') b
on charindex('',''+ltrim(b.n)+'','','',''+a.col1+'','') >0')
-- Author: Ken Wong
-- Create date: 2009-12-21 20:21:11
-- Description:
/*====================================================*/
--> 测试数据:[tb]
if object_id('[tb]') is not null drop table [tb]
create table [tb]([code] varchar(12))
insert [tb]
select '12,23,24,25' union all
select '42,27,24,27' union all
select '15,63,24,27' union all
select '71,23,24,27' union all
select '82,23,24,27'
declare @str varchar(8000)select @str = '25,26,27,28'select r.* from [tb] r join
(select substring(@str,number,
charindex(',',@str+',',number)-number) as number
from master.dbo.spt_values
where type = 'p'
and substring(',' + @str,number,1)=','
) t
on charindex(','+t.number+',',','+r.code+',') > 0
----------------------------
12,23,24,25
42,27,24,27
15,63,24,27
71,23,24,27
82,23,24,27
go
create table ta(col1 varchar(100))
insert into ta select '12,23,24,25'
insert into ta select '12,23'
godeclare @s varchar(1000)
set @s = '25,26,27,28'
set @s =('
select distinct a.*
from ta a
join (select '+replace(@s,',',' as n union all select ')+') b
on charindex('',''+ltrim(b.n)+'','','',''+a.col1+'','') >0')exec(@s)
/*
col1
----------------------------------------------------------------------------------------------------
12,23,24,25(1 行受影响)*/
set @k = '24,25,27'
set @k='select id=' + replace(@k,',',' union all select ')
exec('select a.* from 表A a,(' + @k +') b where charindex('','' + b.id + '','','',''+a.字段+'','')>0')临时表拆分,
http://topic.csdn.net/u/20080123/18/9731d130-0d4b-4c11-8d89-f2c3ca331f0c.htmlxml方法见:
http://topic.csdn.net/u/20081107/17/68aaf5a9-c596-4ab5-ae18-f3370b2ab35b.html
declare @a as xml
select @a=cast('<root><v>' +replace('12,23,24,25',',','</v><v>')+'</v></root>' as xml)
declare @b as xml
select @b=cast('<root><v>' +replace('25,26,12,28',',','</v><v>')+'</v></root>' as xml)select cast(t.c.query('text()') as varchar(10))
from @a.nodes('/root/v') t(c)
intersect
select cast(f.c.query('text()') as varchar(10))
from @b.nodes('/root/v') f(c)----------
12
25(2 行受影响)
sql2000除非你预先在库里保留了一个连续id的临时表,没有的话,count计数某个系统表也是可以,不过性能太差,不考滤。不是必须用存储过程(或批语句)才能实现。
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'
Go--SQL2000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)=','
--2000不使用辅助表
Select
a.Col1,COl2=substring(a.Col2,b.number,charindex(',',a.Col2+',',b.number)-b.number)
from
Tab a join master..spt_values b
ON B.type='p' AND B.number BETWEEN 1 AND LEN(A.col2)
where
substring(','+a.COl2,b.number,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
*/