Lista suspensa com consulta de união

{thistable}.id IN (
    /*Finds booking slots where the booking slot does not overlap
      with any of the existing bookings on that day, 
      or where the booking slot id is the same as the current slot.*/
    SELECT t.id + 3
    FROM fab_booking_slots AS t 
    WHERE t.id = '{fab_booking___book_starttime}'
    OR NOT EXISTS (
        Select 1 
        From  fab_booking_taken AS p1
        Where Date(p1.book_date) = Date('{fab_booking___book_bookingdate}')
        And p1.book_end > t.heuredepart_resa 
        And p1.book_start < t.heurearrivee_resa
    )
)
Order By id Asc;