Oracle

Mám aplikaci v javě, obsahující DB dotazy. Aplikace bohužel musí fungovat na různých DB (MS SQL, ACCESS, Oracle, MySQL...) a dotazy by tedy měly být napsané univerzálně tak, aby fungovaly když ne všude, tak alespoň ve výše uvedených DB. Následující dotaz mi však v Oracle nefunguje :

SELECT GU2C.CPID AS CPID, 
       E.CPID AS ECPID, 
       E.EID AS EID, 
       E.TOTALSTUDYTIME AS STUDY_LENGTH, 
       E.ABSOLVED AS STATUS, 
       E.ENDLEARN AS ABSOLVATION_DATE, 
       TR.TID AS TID, 
       TR.ATTEMPT AS ATTEMPT, 
       TR.SCORE AS RESULT, 
       TR.MINSCORE AS MINSCORE, 
       TR.MAXSCORE AS MAXSCORE, 
       TR.CREATED AS DATE_WHEN_ABSOLVATED_TEST, 
       E.TIME_IN_COURSE AS TIME_IN_COURSE, 
       E.LAST_OPENED AS LAST_OPENED, 
       E.PRINTCOUNT AS PRINTCOUNT, 
       E.LASTPRINT AS LASTPRINT, 
       GU2C.VALIDFROM AS VALIDFROM, 
       GU2C.VALIDTO AS VALIDTO 
FROM (((GU2C LEFT JOIN ENROLLMENTS AS E ON 
        (E.CPID = GU2C.CPID AND E.USRID = ?)) LEFT JOIN 
       TESTRESULTS AS TR ON (E.CPID = TR.CPID AND E.USRID = TR.USRID)) LEFT JOIN 
       NOMINATION AS N ON (N.CPID = GU2C.CPID AND N.USRID = ?)) LEFT JOIN 
     TERMS AS TM ON (N.TERMID = TM.TERMID)  
WHERE (GU2C.USRID = 2) AND (GU2C.CPID IN (4, 3))

Oracle vypíše:

...FROM (((GU2C ...
            *
ERROR na řádku 17: 
ORA-00928: missing SELECT keyword 

Když mu tam to vytoužené SELECT dopíšu, tak začne řvát o kousíček dál:

...FROM (((SELECT GU2C LEFT JOIN...
                             *
ERROR na řádku 17: 
ORA-00923: FROM keyword not found where expected 

Poraďte prosím co s tím