Database Systems MCQs – Practice Test 7 (Chapter 15)

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Introduction to SQL Quiz – Practice Test 7 PDF Download

MCQ 31: The result of Boolean expression 'true and unknown' is:

True
False
Unknown
Null

MCQ 32: The query for finding the department names of all instructors, is:

select dept_name about instructor;
define dept_name from instructor;
select dept_name from instructor;
define dept_name about instructor;

MCQ 33: If 'A' is null for a particular tuple, then the expression result must also be null for that:

Expression
Attribute
Tuple
Relation

MCQ 34: SQL prevents any update to the database that violates an:

Declaration
Definition
Constraint
Attributes

MCQ 35: Since duplicate retention is the default, we shall not use:

Distinct
All
Describe
Whole

Introduction to SQL Quiz App & e-Book – Database Systems Study Material

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