SQL Server：将两行合并为一行

Question

I wrote the this T-SQL query:

SELECT 
    B.[Year], E.[Description] as GLClass, 
    D.Code, D.[GLDescription], 
    SUM(A.Jan) AS Jan, 
    SUM(A.Feb) AS Feb, 
    SUM(A.Mar) AS Mar, 
    SUM(A.Apr) AS Apr
FROM
    GeneralLedgers A 
INNER JOIN
    Years B ON A.YearID = B.ID
INNER JOIN
    CostCenters C ON A.CostCenterID = C.ID
INNER JOIN
    GLCodes D ON A.GLCodeID = D.ID 
INNER JOIN
    GLClassificationTypes E ON D.GLClassificationTypeID = E.ID
WHERE 
    A.YearID = '13' 
GROPU BY 
    B.[Year], D.Code, E.[Description], D.[GLDescription]
ORDER BY 
    D.Code, E.[Description]

It outputs this result:

I want to combine "Freight-in (Go) and Freight Savings" row into a single row and sum the value from column Jan, Feb, Mar, Apr. I was trying to used the Case When clause on the "Code" column to look for '401040110' and '441010300' but still can't figure it out.

How can this be accomplish?

Answer 1

Convert one of the 2 rows into the other for your groupings logic and the rest of the aggregation should work on top of that seamlessly.

SELECT B.[Year]
    ,E.[Description] AS GLClass
    ,case when D.Code = '441010300' then '401040110' else D.Code END    Code
    ,case when D.Code = '441010300' then 'Freight-in (Go)' else  D.[GLDescription] end [GLDescription]
    ,Sum(A.Jan) AS Jan
    ,Sum(A.Feb) AS Feb
    ,Sum(A.Mar) AS Mar
    ,Sum(A.Apr) AS Apr
FROM GeneralLedgers A
INNER JOIN Years B ON A.YearID = B.ID
INNER JOIN CostCenters C ON A.CostCenterID = C.ID
INNER JOIN GLCodes D ON A.GLCodeID = D.ID
INNER JOIN GLClassificationTypes E ON D.GLClassificationTypeID = E.ID
WHERE A.YearID = '13'
GROUP BY B.[Year]
    , case when D.Code = '441010300' then '401040110' else D.Code END   
    , E.[Description]
    , case when D.Code = '441010300' then 'Freight-in (Go)' else  D.[GLDescription] end
ORDER BY 3,2