如何通過組獲得累積和

Question

這裏是理想的結果：

在ID = 14，我需要重置價值暨新cum_value補充。

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

Answer 1

你是不那麼遠，但我已經嘗試用更簡單的查詢：

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