Punjab ICT Computer Test Paper » Set - 9 » Question No - 3

computer test papers

3) Let R be a relation. Which of the following comment about the relation R is not correct?
R will necessarily have a composite key if R is inBCNF but not in 4NF
If R is in 3NF and if every key of R is smple, then R is in BCNF
If R is in BCNF and if R has at least c?e simple key, then R is not in 4NF
If R is in 3NF and if its every key is sfrrple, then R is in 5NF