-

 SELECT

  CASE 

    WHEN type = 'allocated' THEN car_no

    ELSE (SELECT car_no FROM tbl_booked_car_details b2

           WHERE b2.tbl_booking_details_primary_id = bd.tbl_booking_details_primary_id

             AND b2.type = 'allocated'

             ORDER BY allocation_from_date DESC

             LIMIT 1)

  END AS car_no,

   car_no as served_car,

  allocation_from_date,

  allocation_to_date

FROM tbl_booked_car_details bd

ORDER BY car_no, allocation_from_date;

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