如何按组获得累积金额

Question

Here is desired result :

At ID=14, I need to reset cum value add with new cum_value .

SQL : (fiddle : http://sqlfiddle.com/#!6/62f01/14 )

Answer 1

You were not so far, but I've try with less complicated queries :

DECLARE @t table(
        id int
        )

INSERT  INTO @t (id)
VALUES  (0),(1),(2),(3),(4),(5),(6),
        (7),(8),(9),(10),(11),(12),(13),
        (14),(15),(16),(17),(18),(19),
        (20),(21),(22),(23),(24),(99);

SELECT  *
        ,SUM(id)
         OVER(ORDER BY id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS Cum_STEPID
FROM    @t
WHERE   id < 14
UNION
SELECT  *
        ,SUM(CASE WHEN id = 14 THEN 91000 ELSE id END)
         OVER(ORDER BY id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS Cum_STEPID
FROM    @t
WHERE   id >= 14