The reason why a database table is in the second normal form (2nf), but not in the third form (3nf) is because:
a. there is a non-prime attribute that is transitively dependent on the key of the table.
b. there is a one-to-many relationship embedded in the table.
c. both a. and b.
d. neither a. nor b.

Hi!

The correct answer is a. There is a non-prime attribute that is transitively dependent on the key of the table.

Explanation:

By definition, a database table is in 3NF if:

Is 2NF.No nonprime attribute is transitively dependent on any key, this means that no nonprime attribute depends on other nonprime attributes.  Finally, this would mean that all the non-prime attributes must depend only on the keys.

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