Database Systems MCQs – Practice Test 50 (Chapter 15)

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The MCQ: The following query <br> select count (*) <br> from course is used to find; "Introduction to SQL MCQ" App (Android, iOS) with answers: printing (*) in the course relation, printing (*) as the attribute of the course relation, the number of attributes in the course relation, and the number of tuples in the course relation to study distance learning courses. Practice Modification of Database Quiz Questions, download Apple Book (Free Chapter) for information and communication technology.

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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