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Database Systems Entrance Exam: Mock Test 357

Aggregate Functions Quiz Questions and Answers PDF Download - 357

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The Aggregate Functions Quiz Questions and Answers PDF (Aggregate Functions Quiz with Answers PDF e-Book) download Ch. 15-357 to learn Database Systems Practice Tests. Solve Introduction to SQL MCQ with answers PDF, Aggregate Functions Multiple Choice Questions (MCQ Quiz) for computer science programs. The Database Systems Quiz App Download: Free Aggregate Functions App to learn database views, locking techniques for concurrency control, view of data, server system architecture in dbms, aggregate functions test prep for information and communication technology.

The Quiz: The following query <br> select count (*) <br> from course is used to find; "Aggregate Functions" App Download [Free] with answers: printing (*) in the course relation, printing (*) as the attribute of the course relation, the number of tuples in the course relation, and the number of attributes in the course relation for computer science programs. Learn Introduction to SQL Questions and Answers, Apple iBook to download free sample to study distance learning courses.

Aggregate Functions Questions and Answers PDF Download: MCQ 357

MCQ: 1781

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: 1782

A single computer system that do not interact with other computer systems is called

  1. Processed database systems
  2. Decentralized database systems
  3. Centralized database systems
  4. Distributed database systems
MCQ: 1783

A database may also have several schemas at the view level, known as

  1. Optimized schema
  2. Virtual Schema
  3. Model Schema
  4. Subschemas
MCQ: 1784

The concurrency control in which all the data on a specific page is locked is known to be

  1. Page-level locking
  2. Cluster level locking
  3. Data-level locking
  4. System-level locking
MCQ: 1785

AN SQL view is said to be updatable, if the Select clause contains

  1. Only 1 attribute names
  2. Only 2 attribute names
  3. Only 3 attribute names
  4. Only 4 attribute names

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