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if object_id('A') is not null drop table A
go
create table A
(
aa varchar(20),
bb varchar(50)
)
insert into A select 'kk','1,2,3,4,5'
union all select 'mm','22,32,44,4'
union all select 'nn','55,4,43,22,34'
go
select distinct a.aa,substring(a.bb,number,charindex(',',a.bb+',',P.number)-number) bb
from A a
join master..spt_values P
on p.type='P'
and substring(','+a.bb,p.number,1)=','
aa bb
-------------------- --------------------------------------------------
kk 1
kk 2
kk 3
kk 4
kk 5
mm 22
mm 32
mm 4
mm 44
nn 22
nn 34
nn 4
nn 43
nn 55
(14 行受影响)
create table A(aa varchar(10),bb varchar(20))
insert into a values('kk', '1,2,3,4,5')
insert into a values('mm', '22,32,44,4')
insert into a values('nn', '55,4,43,22,34')
create table B(id int,info varchar(10))
insert into b values(1 ,'a')
insert into b values(2 ,'b')
insert into b values(3 ,'c')
insert into b values(4 ,'d')
insert into b values(5 ,'e')
insert into b values(22 ,'f')
insert into b values(32 ,'g')
insert into b values(44 ,'h')
insert into b values(55 ,'i')
go
--方法1.使用临时表完成
SELECT TOP 8000 id = IDENTITY(int, 1, 1) INTO # FROM syscolumns a, syscolumns b
select a.* , b.info from a , b where charindex(','+cast(b.id as varchar) +',',',' + a.bb+',') > 0
and a.aa not in (select distinct aa from
(
SELECT A.aa, bb = SUBSTRING(A.[bb], B.id, CHARINDEX(',', A.[bb] + ',', B.id) - B.id)
FROM A, # B
WHERE SUBSTRING(',' + A.[bb], B.id, 1) = ','
) t where bb not in (select id from b))
DROP TABLE #
drop table a , b
/*
aa bb info
---------- -------------------- ----------
kk 1,2,3,4,5 a
kk 1,2,3,4,5 b
kk 1,2,3,4,5 c
kk 1,2,3,4,5 d
kk 1,2,3,4,5 e
mm 22,32,44,4 d
mm 22,32,44,4 f
mm 22,32,44,4 g
mm 22,32,44,4 h
(所影响的行数为 9 行)
*/
/*
标题:简单数据拆分(version 2.0)
作者:爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开)
时间:2010-05-07
地点:重庆航天职业学院
描述:
有表tb, 如下:
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)
create table tb(id int,value varchar(30))
insert into tb values(1,'aa,bb')
insert into tb values(2,'aaa,bbb,ccc')
go
--方法1.使用临时表完成
SELECT TOP 8000 id = IDENTITY(int, 1, 1) INTO # FROM syscolumns a, syscolumns b
SELECT A.id, value = SUBSTRING(A.[value], B.id, CHARINDEX(',', A.[value] + ',', B.id) - B.id)
FROM tb A, # B
WHERE SUBSTRING(',' + A.[value], B.id, 1) = ','
DROP TABLE #
--方法2.如果数据量小,可不使用临时表
select a.id , value = substring(a.value , b.number , charindex(',' , a.value + ',' , b.number) - b.number)
from tb a join master..spt_values b
on b.type='p' and b.number between 1 and len(a.value)
where substring(',' + a.value , b.number , 1) = ','
--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
--方法1.使用xml完成
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
--方法2.使用CTE完成
;with tt as
(select id,[value]=cast(left([value],charindex(',',[value]+',')-1) as nvarchar(100)),Split=cast(stuff([value]+',',1,charindex(',',[value]+','),'') as nvarchar(100)) from tb
union all
select id,[value]=cast(left(Split,charindex(',',Split)-1) as nvarchar(100)),Split= cast(stuff(Split,1,charindex(',',Split),'') as nvarchar(100)) from tt where split>''
)
select id,[value] from tt order by id option (MAXRECURSION 0)
DROP TABLE tb
/*
id value
----------- ------------------------------
1 aa
1 bb
2 aaa
2 bbb
2 ccc
(5 行受影响)
*/
create table A(aa varchar(10),bb varchar(20))
insert into a values('kk', '1,2,3,4,5')
insert into a values('mm', '22,32,44,4')
insert into a values('nn', '55,4,43,22,34')
create table B(id int,info varchar(10))
insert into b values(1 ,'a')
insert into b values(2 ,'b')
insert into b values(3 ,'c')
insert into b values(4 ,'d')
insert into b values(5 ,'e')
insert into b values(22 ,'f')
insert into b values(32 ,'g')
insert into b values(44 ,'h')
insert into b values(55 ,'i')
go
select a.* , b.* from a , b where charindex(','+cast(b.id as varchar) +',',',' + a.bb+',') > 0
select a.* , b.* from a , b where ',' + a.bb+',' like '%,'+cast(b.id as varchar) +',%'
drop table a , b
/*
aa bb id info
---------- -------------------- ----------- ----------
kk 1,2,3,4,5 1 a
kk 1,2,3,4,5 2 b
kk 1,2,3,4,5 3 c
kk 1,2,3,4,5 4 d
kk 1,2,3,4,5 5 e
mm 22,32,44,4 4 d
mm 22,32,44,4 22 f
mm 22,32,44,4 32 g
mm 22,32,44,4 44 h
nn 55,4,43,22,34 4 d
nn 55,4,43,22,34 22 f
nn 55,4,43,22,34 55 i
(所影响的行数为 12 行)
*/
select a.* , b.* from a , b where charindex(','+cast(a.id as varchar) +',',',' + b.bb+',') > 0
select a.* , b.* from a , b where ',' + b.bb+',' like '%,'+cast(a.id as varchar) +',%'