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One method of actually using a Windows Function in a WHERE clause
WITH MahQuery AS (
SELECT DummyId,
PartitionId,
ROW_NUMBER() OVER (PARTITION BY PartitionId ORDER BY DummyId DESC) AS LastN
FROM dbo.DummyTable
)
SELECT DummyId,
PartitionId,
LastN
FROM MahQuery
WHERE LastN <= 2;
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