Oracle - filter sequal issue

Hello all

I have a problem with a SQL.

I have this SQL bellow that i use to pull resources from a table.

The thing is that in TL_RESOURCE_TRLR A i may have multiple A.TRLR_TYPE_ID based on A.EFFECTIVE

So i only want to extract the most updated effective date per TRLR_TYPE_ID and not all the effective dates even the old one. Just the very last one

How can i update this?

Thanks again for your help

  SELECT   DISTINCT A.CARRIER_ID,
                    A.EFFECTIVE,
                    A.TRLR_TYPE_ID,
                    A.CURRENT_NUM_VEHICLES
    FROM   TL_RESOURCE_TRLR A, CARRIER_EQUIP B
   WHERE       A.CARRIER_ID = B.CARRIER_ID(+)
           AND A.TRLR_TYPE_ID = B.TRLR_TYPE_ID(+)
           AND B.CARRIER_ID IS NULL -- EXCLUDE ROWS ADDED BECAUSE  OF THE OUTER JOIN
ORDER BY   A.CARRIER_ID ASC;