sql - 查询总计应继续添加每行成本列

Question

我有一个包含列的表格

      Operation             Cost

     Material Issue         10 
     Material Return        20
     X                      30
     Y                      40
     Z                      50

我想要一个列所在的查询

     Operation             Cost    Total

     Material Issue         10      10
     Material Return        20      30
     X                      30      60
     Y                      40      100
     Z                      50      150

即..，总计应该随着成本列的每一行不断增加

Answer 1

试试这个

DECLARE @Table TABLE(
        ID INT IDENTITY(1,1),
        Descr VARCHAR(20),
        Val FLOAT
)

INSERT INTO @Table (Descr,Val) SELECT 'X', 10
INSERT INTO @Table (Descr,Val) SELECT 'Y', 20
INSERT INTO @Table (Descr,Val) SELECT 'Z', 50
INSERT INTO @Table (Descr,Val) SELECT 'A', 75
INSERT INTO @Table (Descr,Val) SELECT 'B', 100

SELECT  t1.Descr,
        t1.Val,
        SUM(ISNULL(t2.Val,0))
FROM    @Table t1 LEFT JOIN
        @Table t2 ON t1.ID >= t2.ID
GROUP BY    t1.Descr,
            t1.Val