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if object_id('[TB]') is not null drop table [TB]
go
create table [TB](a varchar(3),b varchar(18))
insert [TB]
select '1',',2,' union all
select '2',',2,3,'
GO
select a,
b=substring(right(b,len(b)-1),number,charindex(',',right(b,len(b)-1),number)-number)
from tb t,master..spt_values s
where type='p' and number>0
and substring(left(b,len(b)-1),number,1)=','
a b
---- ------------------
1 2
2 2
2 3
(所影响的行数为 3 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)
*/
if object_id('[TB]') is not null drop table [TB]
go
create table [TB](a varchar(3),b varchar(18))
insert [TB]
select '1',',2,' union all
select '2',',2,3,'
GO
create view v_list
as
select B.a,substring(B.b,p.number,charindex(',',B.b+',',p.number)-p.number) b
from
(
select a,substring(left(b,len(b)-1),2,len(b)-1) b from [TB]
) B
join master..spt_values p
on p.type='P'
and charindex(',',','+B.b,number)=number
select * from v_list
a b
---- ------------------
1 2
2 2
2 3
(3 行受影响)
CREATE TABLE A
(
A INT,
B VARCHAR(10)
)
INSERT INTO A
SELECT 1,',2,' UNION ALL
SELECT 2,',2,3,'
CREATE VIEW VIEW_A
AS
SELECT A.A, B.value FROM
(
SELECT A, B = CONVERT(xml,'<root><v>' + REPLACE(B, ',', '</v><v>') + '</v></root>') FROM A
) A OUTER APPLY
(
SELECT value = N.v.value('.', 'varchar(100)') FROM A.B.nodes('/root/v') N(v)
) B
WHERE B.value<>''
SELECT * FROM VIEW_A
---------
A value
1 2
2 2
2 3
create view vv
as
select a,
b=substring(right(b,len(b)-1),charindex(right(b,len(b)-1),',',number)-number)
from a t,master..spt_values s
where type='p' and number>0
and substring(left(b,len(b)-1),len(b)-1),,number,1)=','
if object_id('[TB]') is not null drop table [TB]
go
create table [TB]([COL1] varchar(3),[COL2] varchar(18))
insert [TB]
select 'ABC','123,4568,1234565' union all
select 'DBD','1231,56455,5645665'
GO
select B.[COL1],substring(B.[COL2],p.number,charindex(',',B.[COL2]+',',p.number)-p.number) [COL2]
from TB B
join master..spt_values p
on p.type='P'
and charindex(',',','+B.[COL2],number)=number
COL1 COL2
---- ------------------
ABC 123
ABC 4568
ABC 1234565
DBD 1231
DBD 56455
DBD 5645665
(6 行受影响)
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