Question: QUESTION 21 A key in a relational database table a.a proper subset of a candidate key. b.a proper superset of a candidate key. c.a minimal

QUESTION 21

A key in a relational database table

a.a proper subset of a candidate key.

b.a proper superset of a candidate key.

c.a minimal superkey.

d.none of a., b., or c. are correct.

QUESTION 24

In __________________, the number of (first-level) index entries is equal to the number of records in data file.

a.primary index

b.cluster index

c.secondary index

d.multi-level index

QUESTION 30

Which of the following is equivalent to the semi-join expression: R X S?

a.S X R

b.S X R

c.R X S

d.None of them.

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