If D1, D2...Dn are domains in a relational model, then the relation is a…
2015
If D1, D2...Dn are domains in a relational model, then the relation is a table, which is a subset of
- A.
D1⊕D2⊕...⊕Dn
- B.
D1xD2x...xDn
- C.
D1∪D2∪...∪Dn
- D.
D1∩D2∩...∩Dn
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Correct answer: B
In the relational database model, a relation is formally defined as a subset of the Cartesian product of its underlying domains. For domains D1, D2, ..., Dn, the relation is a subset of the Cartesian product D1 × D2 × ... × Dn.
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