The first normal form for relations definition that a relation must contain no m

Question

The first normal form for relations definition that a relation must contain no multivalued attributes has an equivalent form for ER: all attributes must be single-valued. Select one: True False Question 9 A relation may be in second normal form without being in first normal form. Select one: True False A relation in which a nonkey attribute is dependent on another non-key attribute is in third normal form. Select one: True False Third normal form is important because Select one: a. It eliminates partial functional dependencies b. It eliminates transitive dependencies that can create anomalies c. It removes multivalued dependencies d. It requires that a primary key be defined to uniquely identify each row

Explanation / Answer

Question The first normal form for relations definition that a relation must contain no multivalued attributes has an equivalent form for ER: all attributes must be single-valued.

False

multivalued attribute is represented as double oval in ER diagram.

Question 9 A relation may be in second normal form without being in first normal form.

False

A relation is in second normal form if and only if it is in First Normal form

Question A relation in which a nonkey attribute is dependent on another non-key attribute is in third normal form. False

This is transitive dependency and must be removed in Third Normal Form

Third normal form is important because

b. It eliminates transitive dependencies that can create anomalies

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