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Database Systems MCQs – Practice Test 50 (Chapter 15)

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Introduction to SQL MCQ – Practice Test 50 PDF Download

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

  1. Printing (*) as the attribute of the course relation
  2. Printing (*) in the course relation
  3. the number of attributes in the course relation
  4. 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:

  1. Is added to result
  2. Is not added to result
  3. Is stored
  4. Is sorted

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

  1. Drop command
  2. Delete command
  3. Eliminate command
  4. Abort command

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

  1. Instances only
  2. Attributes only
  3. Tuples
  4. Distinct values

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

  1. smallint
  2. real
  3. double
  4. int

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