Database management systems

Q3 Mark the following statements as T (True) or F (False). The FD AB->A holds for ALL instances of a relation R with three attributes A, B, and C. A superkey contains a key Every lossless join decomposition is also a dependency preserving decomposition Selection operator in relational algrebra can change the schema of the input relation - We can tell that a functional dependency holds on a relation, by looking at one instance of that relation. Every 3NF relation is also in BCNF The logical expression "TRUE OR UNKNOWN" evaluates to FALSE Set valued attributes are allowed in First Normal Form. If we have X >Y and X > Z as funcional dependencies then X YZ holds Functional dependencies identify possible redundancies