Latch type and sql hash value - oracle database script

SET lines 160 pages 100 COLUMN event format A35 COLUMN name format A35
SELECT x.event,
       x.sql_hash_value,
       CASE
           WHEN x.event LIKE 'latch%' THEN l.name
           ELSE ' '
       END name,
       x.cnt
FROM
  (SELECT substr(w.event, 1, 28) event,
          s.sql_hash_value,
          w.p2,
          count(*) cnt
   FROM v$session_wait w,
        v$session s,
        v$process p
   WHERE s.sid=w.sid
     AND p.addr = s.paddr
     AND s.username IS NOT NULL
     AND w.event NOT LIKE '%pipe%'
     AND w.event NOT LIKE 'SQL*%'
   GROUP BY substr(w.event, 1, 28),
            sql_hash_value,
            w.p2) x,
     v$latch l
WHERE x.p2 = l.latch#(+)
ORDER BY cnt;