Database Systems MCQs - Chapter 15

Introduction to SQL Quiz Questions and Answers PDF - 7

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The Quiz: Result of Boolean expression 'true and unknown' is; "Introduction to SQL" App Download iOS & Android (Free) with answers false, true, unknown and null to learn software engineering courses. Study set operations quiz questions, download Amazon eBook (Free Sample) for computer majors.

Introduction to SQL Questions & Answers PDF Download: MCQ Quiz 7

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

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