Database Systems MCQs – Practice Test 50 (Chapter 15)

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The "Introduction to SQL MCQ" App Download (iOS & Android): If the where clause predicate evaluates to either false or unknown for a tuple, that tuple; MCQ with answers: is not added to result, is added to result, is stored, and is sorted. Practice Modification of Database Quiz Questions, download Apple Book (Free Chapter) to gain database skills.

Introduction to SQL MCQ – Practice Test 50 PDF Download

MCQ 246: The following query
select count (*)
from course; is used to find:

Printing (*) as the attribute of the course relation
Printing (*) in the course relation
the number of attributes in the course relation
the number of tuples in the course relation

MCQ 247: If the where clause predicate evaluates to either false or unknown for a tuple, that tuple:

Is added to result
Is not added to result
Is stored
Is sorted

MCQ 248: The command that deletes not only all tuples of r, but also the schema for r.:

Drop command
Delete command
Eliminate command
Abort command

MCQ 249: For membership in a relation, SQL allows testing of:

Instances only
Attributes only
Tuples
Distinct values

MCQ 250: The data type that is a finite subset of the integers that is machine dependent, is said to be:

smallint
real
double
int

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