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Database Management SystemWhich of the following is true? (i) Every relation in 3NF is also in BCNF (ii) A relation R is in 3NF if very non-prime attribute of R is fully functionally dependent on every key of R (iii) Every relation in BCNF is also in 3NF (iv) No relation can be in both BCNF and 3NF20192mDatabase Management SystemA relation is in BCNF if: (i) Every non-prime attribute depends on key (ii) Every FD is trivial (iii) Every determinant is a superkey (iv) Every attribute is atomic20252mDatabase Management SystemWhich statement is FALSE? (i) Every weak entity depends on a strong entity (ii) A weak entity can have a partial key (iii) Every many-to-many relationship becomes a separate relation (iv) Every relation generated from ER always has a single candidate key20252mDatabase Management SystemFor relation: R(A,B,C); FDs={A \rightarrow B, B \rightarrow A}. Which statement is true? (i) A and B both are candidate keys (ii) Only A is key (iii) Only B is key (iv) Neither A nor B is key20252m
PreviousThe different levels of data abstraction are: (i) Physical level (ii) Logical level (iii) View level (iv) all of the aboveNextWhat is the purpose of project operation: (i) It selects certain columns. (ii) It selects certain rows. (iii) It selects certain strings. (iv) It selects certain integers.
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