Which forms have a relation that contains information about a single entity?
A. 4NF
B. 2NF
C. 5NF
D. 3NF
Answer:A
Which forms have a relation that contains information about a single entity?
A. 4NF B. 2NF C. 5NF D. 3NF
Explanation: If and only if, for each of its non-trivial multivalued dependencies X \twoheadrightarrow Y, a table is in 4NF. X is a superkey—that is, X is either a candidate key or a superset thereof.