Running Multiplication in T-SQL

Question

GTS Table

CCP months   QUART   YEARS  GTS
----  ------  -----    ----- ---
CCP1    1       1   2015    5
CCP1    2       1   2015    6
CCP1    3       1   2015         


        

Answer 1

Another alternative is using stacked/cascaded CTEs:

;WITH CteFirstQtr AS(
    SELECT g.*, 
        result = b.BASELINE * g.GTS
    FROM gts g
    INNER JOIN BASELINE b
        ON b.CCP = g.CCP
        AND b.YEARS = g.YEARS
        AND b.QUART = g.QUART
),
CteSecondQtr AS(
    SELECT g.*,
        result = t.result * g.gts
    FROM gts g
    CROSS APPLY(
        SELECT SUM(result)
        FROM CteFirstQtr
        WHERE
            CCP = g.CCP
            AND Years = g.Years
            AND QUART = 1
    )t(result)
    WHERE g.QUART = 2
),
CteThirdQtr AS(
    SELECT g.*,
        result = t.result * g.gts
    FROM gts g
    CROSS APPLY(
        SELECT SUM(result)
        FROM CteSecondQtr
        WHERE
            CCP = g.CCP
            AND Years = g.Years
            AND QUART = 2
    )t(result)
    WHERE g.QUART = 3
),
CteFourthQtr AS(
    SELECT g.*,
        result = t.result * g.gts
    FROM gts g
    CROSS APPLY(
        SELECT SUM(result)
        FROM CteThirdQtr
        WHERE
            CCP = g.CCP
            AND Years = g.Years
            AND QUART = 3
    )t(result)
    WHERE g.QUART = 4
)
SELECT *  FROM CteFirstQtr UNION ALL
SELECT *  FROM CteSecondQtr UNION ALL
SELECT *  FROM CteThirdQtr UNION ALL
SELECT *  FROM CteFourthQtr