SQL Server - Select first row that meets criteria

Question

I have 2 tables that contain IDs. There will be duplicate IDs in one of the tables and I only want to return one row for each matching ID in table B. For example:

Table

Answer 1

;WITH CTE
AS (
    SELECT  B.objectIdA
           ,A.objectIdB
           ,ROW_NUMBER() OVER (PARTITION BY B.objectIdA ORDER BY A.objectIdB DESC) rn
    FROM TableA A 
    INNER JOIN TableB B ON A.objectIdA = B.objectIdA
   )
SELECT C.objectIdA
      ,C.objectIdB
FROM CTE 
WHERE rn = 1