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Database Systems MCQs – Practice Test 8 (Chapter 15)

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Free Introduction to SQL Notes App Download: We define an SQL relation by using the command; MCQ with answers: define table, create table, namespace, and name table. Practice View of Data Quiz Questions, download Kobo e-Book (Free Chapter) for database online resources.

Introduction to SQL MCQs – Practice Test 8 PDF Download

MCQ 36: The command to delete the relation is:

  1. Delete from *example*
  2. Delete about *example*
  3. Abort from *example*
  4. Abort about *example*

MCQ 37: We define an SQL relation by using the command:

  1. create table
  2. define table
  3. namespace
  4. name table

MCQ 38: The number of error(s) in the following query is/are:
select avg (salary)
from instructor;
where dept name=Comp. Sci.
:

  1. 1
  2. 2
  3. 3
  4. 4

MCQ 39: The aggregate operations, when an empty collection is applied on the function, return a:

  1. 0
  2. 1
  3. Undefined value
  4. Null value

MCQ 40: The result relation has all attributes from all the relations in the:

  1. Select clause
  2. IN clause
  3. From clause
  4. Define clause

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