IN SQL

For the following 3 tables: PRODUCT(ID(PK), PNAME) SUPPLIER(SID(PK, SNAME) SUPPLIES(SUID(PFK), PID(PFK)) -- SUID references SUPPLIER's SID, PID references PRODUCT's ID FACTORY(FID(PK), OID(FK)) -- OID references SUPPLIER' SID To get ids of factories which might make the product "Acme Jetpack", what goes in the blank? SELECT FID FROM PRODUCT, SUPPLIER, SUPPLIES, FACTORY WHERE PNAME = 'Acme Jetpack' AND