CREATE OR REPLACE VIEW v_current_enquiry_status AS
SELECT enqu_id
      ,event_date
      ,enst_code
  FROM (SELECT enqu_id
              ,event_date
              ,enst_code
              ,decode(enst_code
                     ,'INP'
                     ,1
                     ,'SUBMITTED'
                     ,2
                     ,'QUOTED'
                     ,3) AS this_event
              ,MAX(decode(enst_code
                         ,'INP'
                         ,1
                         ,'SUBMITTED'
                         ,2
                         ,'QUOTED'
                         ,3)) over(PARTITION BY enqu_id) AS max_event
          FROM enquiry_events)
 WHERE this_event = max_event;