SQL Server字符串组合

Question

我想返回一个行表，其中包含MS SQL 2008中字符串的所有可能组合。例如字符串“01-02-03-04”：

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