如何在存储过程中使用循环拆分逗号分隔的字符串

问题描述

如何使用循环分割逗号分隔的字符串

How to split the comma separated string with out using loop

例如:-

我有逗号分隔的字符串，如 4,3,5,2,5,9

I have the string which has commma separated like 4,3,5,2,5,9

如果我想在不使用循环的情况下获取第三个逗号之后的字符串.

if i like to get the string after 3rd comma without using loop.

推荐答案

DECLARE @str varchar(MAX)='001,002,03,0004,05,6,07'
    ,@separator char(1)=','
    ,@n int = 3;

WITH str_nums ( id, n1, n2 ) 
AS 
( 
SELECT CAST(1 as int) as id, CAST(0 as bigint) as n1, CHARINDEX(@separator, @str+@separator) as n2
UNION ALL
SELECT id + 1, n2 as n1, CHARINDEX(@separator, @str+@separator, n2+1) as n2
FROM str_nums
WHERE n2<len(@str)
) 

SELECT SUBSTRING(@str, n1+1, n2-n1-1) as n_str
FROM str_nums
WHERE id = @n
GO

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