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Chapter 15: Database Systems Exam Tests

Database Systems MCQs - Chapter 15

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

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

A) True
B) False
C) Unknown
D) Null

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

A) select dept_name about instructor;
B) define dept_name from instructor;
C) select dept_name from instructor;
D) 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

A) Expression
B) Attribute
C) Tuple
D) Relation

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

A) Declaration
B) Definition
C) Constraint
D) Attributes

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

A) Distinct
B) All
C) Describe
D) Whole

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Database Management System App (Android & iOS)

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Semantic Web App (Android & iOS)

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Computer Fundamentals App (Android & iOS)