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Database Systems Exam Prep MCQs – Mock Test 252

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Free "Aggregate Functions MCQs" App Download (iOS & Android): Output of the query: <br> select avg (salary) <br> from instructor <br> where dept name='Comp. Sci.' <br>; MCQ with answers: salary of instructors in the computer science department., average salary of instructors in the computer science department., maximum salary of instructors in the computer science department, and average salary in the computer science department.. Practice Introduction to SQL Questions and Answers, Google e-Book to download free chapter for database administration learning.

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MCQ 1256: The output of the query:
select avg (salary)
from instructor
where dept name='Comp. Sci.';
:

  1. Average salary of instructors in the Computer Science department.
  2. Salary of instructors in the Computer Science department.
  3. Average salary in the Computer Science department.
  4. Maximum salary of instructors in the computer science department

MCQ 1257: A modification to the database expressed in terms of a view must be translated to a:

  1. Physical model of database
  2. Logical model of database
  3. View model of database
  4. Virtual model of database

MCQ 1258: SQL provides a rich DDL that allows one to define:

  1. Tables
  2. Integrity Constraints
  3. Assertions
  4. All of the Above

MCQ 1259: Multiples of rollup and cube operations can be used in a single:

  1. having by clause
  2. Group by clause
  3. select clause
  4. define clause

MCQ 1260: To find logically implied functional dependencies, the types of rules to be followed are of type:

  1. 2 types
  2. 3 types
  3. 4 types
  4. 5 types

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