Which constraint ensures that a column cannot have NULL values? MCQ with Answer and Explanation
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Practice More Database Management System (DBMS) Questions
Question #1
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Which of the following is a purpose of a database management system?
Correct Answer: Option D
Explanation:
A DBMS provides functionalities for defining, constructing, manipulating, and controlling access to databases.
A DBMS provides functionalities for defining, constructing, manipulating, and controlling access to databases.
This question belongs to:
Computer
Database Management System (DBMS)
Question #2
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What is the concept of data independence?
Correct Answer: Option D
Explanation:
Data independence is the capacity to change the database schema at one level without affecting the next higher level, minimizing impact on applications.
Data independence is the capacity to change the database schema at one level without affecting the next higher level, minimizing impact on applications.
This question belongs to:
Computer
Database Management System (DBMS)
Question #3
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What is a composite index?
Correct Answer: Option C
Explanation:
A composite index is created on two or more columns, often used to speed up queries that filter on those columns.
A composite index is created on two or more columns, often used to speed up queries that filter on those columns.
This question belongs to:
Computer
Database Management System (DBMS)
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