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Q.

Using the ______ clause retains only one copy of such identical tuples.

A

Null

B

Unique

C

Not null

D

Distinct

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3.

Domain constraints, functional dependency and referential integrity are special forms of _________

A

Foreign key

B

Primary key

C

Assertion

D

Referential constraint

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4.

Triggers ________ enabled or disabled

A

Can be

B

Cannot be

C

Ought to be

D

Always

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5.

All aggregate functions except _____ ignore null values in their input collection.

A

Count

B

Count

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Avg

D

Sum

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