SQL字符转⾏⽤逗号分开的某字段转记录
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 TOP8000 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
pe='p'and b.number between1 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
(sql 字符串转数组
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

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