SQL gåta, hur man väljer senaste datum för del, men bara 1 rad per del (unik)

  SELECT *
  FROM   (SELECT i.*,
      ROW_NUMBER() OVER(PARTITION BY ldPart ORDER BY ldDate DESC) r
      FROM   inventoryReport i
      WHERE  ldPart in ('ABC123', 'BFD21', 'AA123', etc)
         )
  WHERE  r = 1