Database Systems Practice Test 313

Set Operations Quiz Questions and Answers PDF - 313

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Set Operations Questions and Answers PDF Download: Quiz 313

MCQ 1561: The result of Boolean expression 'true or unknown' is

A) False

B) Null

C) Unknown

D) True

MCQ 1562: Database systems have several schemas, partitioned according to the

A) Data

B) Constraints

C) Requirement

D) Level of abstraction

MCQ 1563: The number of errors in the following subquery is/are
(select salary
from instructor
where dept name=Biology)

A) 0

B) 1

C) 2

D) 3

MCQ 1564: Query processor component of the database system translates DML queries into sequences of actions at the

A) Physical Level

B) Logical Level

C) View Level

D) Virtual Level

MCQ 1565: The difference of entities must be expressed in terms of their

A) Values

B) Locators

C) Size

D) Attributes

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