SQL服務器字符串組合

Question

我會想返回表的行包括在MS SQL 2008的字符串的所有可能的組合，例如字符串「01-02-03-04」的：

1. 01 - 02 - 03 - 04
2. 02 - 03 - 04
3. 01 - 03 - 04
4. 01 - 02 - 04
5. 01 - 02 - 03
6. 01 - 02
7. 01 - 03
8. 01 - 04
9. 02 - 03
10. 02 - 04
11. 03 - 04

Answer 1

DECLARE @s varchar(150); 
SET @s = '01-02-03-05-10'; 
WITH split AS (
    SELECT 
    CAST(SUBSTRING(@s, number * 3 + 1, 2) AS varchar(150)) AS item, 
    rn = number 
    FROM master..spt_values 
    WHERE type = 'P' AND number between 0 AND LEN(@s)/3 
), 
combined AS (
    SELECT 
    item, 
    rn, 
    itemcnt = 1 
    FROM split 
    UNION ALL 
    SELECT 
    item = CAST(c.item + '-' + n.item AS varchar(150)), 
    n.rn, 
    itemcnt = c.itemcnt + 1 
    FROM split n 
    INNER JOIN combined c ON n.rn > c.rn 
) 
SELECT * 
FROM combined 
WHERE itemcnt > 1 
ORDER BY 1