Database Systems Practice Test 357

Aggregate Functions Quiz Questions and Answers PDF - 357

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The Quiz: Following query
select count (*)
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 attributes in the course relation and the number of tuples in the course relation to study distance learning courses. Solve introduction to sql questions and answers, Amazon eBook to download free sample for information and communication technology.

Aggregate Functions Questions and Answers PDF Download: Quiz 357

MCQ 1781: The following query
select count (*)
from course; is used to find

A) Printing (*) as the attribute of the course relation

B) Printing (*) in the course relation

C) the number of attributes in the course relation

D) the number of tuples in the course relation

MCQ 1782: A single computer system that do not interact with other computer systems is called

A) Processed database systems

B) Decentralized database systems

C) Centralized database systems

D) Distributed database systems

MCQ 1783: A database may also have several schemas at the view level, known as

A) Optimized schema

B) Virtual Schema

C) Model Schema

D) Subschemas

MCQ 1784: The concurrency control in which all the data on a specific page is locked is known to be

A) Page-level locking

B) Cluster level locking

C) Data-level locking

D) System-level locking

MCQ 1785: AN SQL view is said to be updatable, if the Select clause contains

A) Only 1 attribute names

B) Only 2 attribute names

C) Only 3 attribute names

D) Only 4 attribute names

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