SQL Server : merge two rows into one - sql

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