看看使用ROW_NUMBER
就像是
;WITH Vals AS (
SELECT p.ParentID,
sc.SubChildID,
ROW_NUMBER() OVER (PARTITION BY p.ParentID ORDER BY sc.[Date] DESC) RowID
FROM Parent p INNER JOIN
Child c ON p.ParentID = c.ParentID INNER JOIN
SubChild sc ON c.ChildID = sc.ChildID
)
SELECT ParentID,
SubChildID
FROM Vals
WHERE RowID = 1
602392714
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