Find top disk_reads by an user - oracle database script

SELECT username users,
       round(DISK_READS/Executions) DReadsExec,
       Executions EXEC,
                  DISK_READS DReads,
                  sql_text
FROM gv$sqlarea a,
     dba_users b
WHERE a.parsing_user_id = b.user_id
  AND Executions > 0
  AND DISK_READS > 100000
ORDER BY 2 DESC;