拆列问题

[xuam]

表table

数据:
col
A
B/C
D/E/F
G/H


结果要求:
A
B
C
D
E
F
G
H
咋拆？ sql2000

[喜-喜]

都是神...

[dawugui]

参考:

/*
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)
*/

[AcHerat]

create table tb(val varchar(10))
insert into tb
select 'A' union all
select 'B/C' union all
select 'D/F/E'
go

select val = substring(a.val , b.number , charindex('/' , a.val + '/' , b.number) - b.number) 
from tb a join master..spt_values  b 
	on b.type='p' and b.number between 1 and len(a.val)
where substring('/' + a.val , b.number , 1) = '/'

drop table tb

/*
val
----------
A
B
C
D
F
E

(6 行受影响)

[--小F--]

select 
 col = substring(a.col , b.number , charindex('/' , a.col + '/' , b.number) - b.number) 
from
 tb a 
join master..spt_values  b 
on
 b.type='p' and b.number between 1 and len(a.col)
where
 substring('/' + a.col , b.number , 1) = '/'

[快溜]

create table tb(val varchar(10))
insert into tb
select 'A' union all
select 'B/C' union all
select 'D/F/E'
go
select b.id from tb a,(select 'A' as id union select 'B' union select 'C' union select 'D' 
                       union select 'E' union select 'F') b
where CHARindex(b.id+'/',a.val+'/')>0
/*
id
----
A
B
C
D
E
F

[叶子]

declare @table table (col varchar(5))
insert into @table
select 'A' union all
select 'B/C' union all
select 'D/E/F' union all
select 'G/H'

SELECT  col = SUBSTRING(a.col, b.number,
                        CHARINDEX('/', a.col + '/', b.number) - b.number)
FROM    @table a
        JOIN master..spt_values b ON b.type = 'p'
                                     AND b.number BETWEEN 1 AND LEN(a.col)
WHERE   SUBSTRING('/' + a.col, b.number, 1) = '/'
/*
col
-----
A
B
C
D
E
F
G
H
*/