Thanks for the idea, the below query did the trick for me..
SELECT t.FILESYSTEM,t.KBYTES,t.LAST_UPDATE,t.LOG_DATE,t.MOUNTED_ON,t.SERVER_NAME,t.S_NAME,O.GROUPNAME FROM (SELECT TO_CHAR(D.SYS_DATE,'YYYY-MM-DD HH24:MI:SS') AS LOG_DATE,
TO_NUMBER(TO_CHAR(D.ROLLUP_DATE, 'yyyymmddhh24miss')) AS LAST_UPDATE,
S.SERVER_NAME AS S_NAME,
S.SERVER_NAME,D.FILESYSTEM,
D.MOUNTED_ON, D.KBYTES
FROM SERVER_DATA.SERVER S, SERVER_DATA.SERVER_DFK_CURRENT D
WHERE D.SERVER_NAME = S.SERVER_NAME) t
LEFT OUTER JOIN SERVER_DATA.ORACLE_INFO O ON t.SERVER_NAME = O.SERVER_NAME
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