Efficiently selecting “sub maxes” from SQL Table?

With cteRowNumbers as ( select A, B, ROW_NUMBER() over(partition by B, left(A,2) order by A desc) as RowNumber from YourTable ) select A, B from cteRowNumbers where RowNumber = 1 order by A.

If you find common table expressions unpleasant, there's this which is essentially the same thing as the CTE example. SELECT V. * FROM ( SELECT A ,B ,ROW_NUMBER()OVER(PARTITION BY B,LEFT(A,2) ORDER BY A DESC) AS RowNumber FROM YourTable ) AS V WHERE V.

RowNumber = 1.

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