EXISTS Vs IN clause usage in query

Hi,
Can anyone please tell me how to rewrite the same query using IN clause instead of EXIST( NOT EXIST) clause.
I guess use of IN operator instead of EXIST in this case would certainly improve query performance as the selective predicates are in subquery and not in Parent query.
This is the query :
SELECT pva.price_dt,
pva.sec_id,
pva.vendor_product_id,
pva.price_typ,
pva.price,
pvp.curcy_cd,
pvp.precedence,
pvp.exch_cd,
pvp.price_srce_cd,
psq1.scrub_queue_id,
pva.prc_derivation_cd,
'Alternate Price' as location
FROM prc_vendor_price pvp,
prc_vendor_alternate_price pva,
prc_scrub_queue psq1
WHERE psq1.sec_id=pva.sec_id
AND psq1.sec_id=pvp.sec_id
AND pva.sec_id=pvp.sec_id
AND psq1.eff_dt=pva.price_dt
AND psq1.eff_dt=pvp.price_dt
AND pva.price_dt=pvp.price_dt
AND pvp.prc_derivation_cd=pva.prc_derivation_cd
AND pva.vendor_product_id=pvp.vendor_product_id
AND NOT EXISTS (SELECT 1
FROM prc_vendor_price pvp2
WHERE pva.sec_id=pvp2.sec_id
AND pva.price_dt=pvp2.price_dt
AND pva.price=pvp.price
AND pva.price_typ=pvp2.price_typ
AND pva.prc_derivation_cd=pvp2.prc_derivation_cd
AND pva.vendor_product_id=pvp2.vendor_product_id)
I know how to do it for query with single table but dont know how to do it for multiple tables and joins so please gimme some hint.
Thanks,
Aashish

How about not using NOT IN or NOT EXISTS...
SELECT pva.price_dt,
       pva.sec_id,
       pva.vendor_product_id,
       pva.price_typ,
       pva.price,
       pvp.curcy_cd,
       pvp.precedence,
       pvp.exch_cd,
       pvp.price_srce_cd,
       psq1.scrub_queue_id,
       pva.prc_derivation_cd,
       'Alternate Price' as location
FROM prc_vendor_price pvp JOIN prc_vendor_alternate_price pva ON (pva.sec_id=pvp.sec_id
                                                              AND pva.price_dt=pvp.price_dt
                                                              AND pva.vendor_product_id=pvp.vendor_product_id
                                                              AND pvp.prc_derivation_cd=pva.prc_derivation_cd)
                          JOIN prc_scrub_queue psq1 ON (psq1.sec_id=pva.sec_id
                                                    AND psq1.sec_id=pvp.sec_id
                                                    AND psq1.eff_dt=pva.price_dt
                                                    AND psq1.eff_dt=pvp.price_dt)
               LEFT OUTER JOIN prc_vendor_price pvp2 ON (pva.sec_id=pvp2.sec_id
                                                     AND pva.price_dt=pvp2.price_dt
                                                     AND pva.price=pvp.price
                                                     AND pva.price_typ=pvp2.price_typ
                                                     AND pva.prc_derivation_cd=pvp2.prc_derivation_cd
                                                     AND pva.vendor_product_id=pvp2.vendor_product_id)
WHERE pvp2.sec_id is null

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