Pga usage by sessions - oracle database script

SET lines 2000
SELECT SID,
       b.NAME,
       ROUND(a.VALUE/(1024*1024), 2) MB
FROM v$sesstat a,
     v$statname b
WHERE (NAME LIKE '%session uga memory%'
       OR NAME LIKE '%session pga memory%')
  AND a.statistic# = b.statistic# order by ROUND(a.VALUE/(1024*1024),2) desc