If RDBMS1, RDBMS2, RDBMS3 are attributes in a relation and S is another relation, which of the following is an incorrect

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answerhappygod
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If RDBMS1, RDBMS2, RDBMS3 are attributes in a relation and S is another relation, which of the following is an incorrect

Post by answerhappygod »

a) foreign key(RDBMS1, RDBMS2)
b) foreign key(RDBMS1, RDBMS2) references S
c) primary key(RDBMS1, RDBMS2, RDBMS3)
d) primary key(RDBMS1)
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