sql problem more difficult to appear in the forum: 38 (split character string retrieval problems)

Original: SQL problem more difficult to appear in the forum: 38 (split character string retrieval problems)

Recently, in the forum, I met a lot more difficult sql problem, although they can be resolved, but found a few days later, they can not remember, forget the solution of.

So, I feel the need to be recorded, so that after the encounter this problem again, and get answers from the idea.

String retrieval problems: http: //bbs.csdn.net/topics/390608926

This problem is a variant http://bbs.csdn.net/topics/390530288
Table
ID IndexArr
. 1 1,2,3,4,5
2 55,6,99,87,1000
. 3 7,567567,567,43,123

IndexArr is "," division number
now string '2,34,45,345,867,4,984'  
now is to retrieve each digital IndexArr appear in the string through the result set.

My solution:

    
    
--1.函数
if exists( select * from sys.objects where name = 'f_splitSTR' and type = 'tf')
drop function dbo.f_splitSTR
go

create function dbo.f_splitSTR
(
@s varchar( 8000), --要分拆的字符串
@ split varchar( 10) --分隔字符
)
returns @re table( --要返回的临时表
col varchar( 1000) --临时表中的列
)
as
begin
declare @ len int

set @ len = LEN(@ split) --分隔符不一定就是一个字符，可能是2个字符

while CHARINDEX(@ split,@s) > 0
begin
insert into @re
values( left(@s, charindex(@ split,@s) - 1))

set @s = STUFF(@s, 1, charindex(@ split,@s) - 1 + @ len , '') --覆盖：字符串以及分隔符
end

insert into @re values(@s)

return --返回临时表
end
go



--> 测试数据：[tb]
if object_id( '[tb]') is not null
drop table [tb]
go

create table [tb]([ ID] int,[IndexArr] varchar( 19))
insert [tb]
select 1, '1,2,3,4,5' union all
select 2, '55,6,99,87,1000' union all
select 3, '7,567567,567,43,123' union ALL
SELECT 4, '2,34,45'



--------------开始查询--------------------------
DECLARE @s VARCHAR( 1000)

SET @s= '2,34,45,345,867,4,984'


;with t
as
(
select t.ID,
t.IndexArr,
f.col,

--把IndexArr按照分隔符,拆分成了多少个字符串
COUNT(*) over( PARTITION by IndexArr) as split_str_count
from tb t
cross apply dbo.f_splitSTR(t.IndexArr, ',') f
)

select t.ID,
t.IndexArr
from t
where charindex( col, ','+@s+ ',') > 0
group by t.ID,
t.IndexArr,
t.split_str_count
having COUNT(*) = t.split_str_count --比如2,34,45分拆为3个字符串，
--那么在经过where条件过滤后，记录数也必须是3
--这样说明了indexarr中的字符串都在@s变量中出现了