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Need help with building a query with LAST function

Last Modified: 2018-01-11
I have Query A, with fields ColA, ColB, Col C and ColD, and sorted in ascending order of ColA.

I wish to build Query B with fields ColB, Col C and the LAST (ColD) that appears in Query A.

I tried to build the query using SELECT .... GROUP BY. But as soon as I add Col B and Col C as the first two columns, it messes up the original sorting of Query A and affects the result of the function LAST (ColD).
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