What type of key uniquely identifies each record in a table and cannot contain NULL values? MCQ with Answer and Explanation
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Question #1
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What is an alternate key?
Correct Answer: Option B
Explanation:
An alternate key is any candidate key that is not the primary key.
An alternate key is any candidate key that is not the primary key.
This question belongs to:
Computer
Database Management System (DBMS)
Question #2
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In the context of databases, what is a 'tuple'?
Correct Answer: Option A
Explanation:
In relational databases, a tuple is a single row or record of a table.
In relational databases, a tuple is a single row or record of a table.
This question belongs to:
Computer
Database Management System (DBMS)
Question #3
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What is an attribute called when it can hold more than one value for a single entity instance, such as multiple phone numbers for a person?
Correct Answer: Option C
Explanation:
A Multi-valued Attribute is an attribute that can store multiple distinct values for a single entity instance (e.g., skill_set, phone_numbers).
A Multi-valued Attribute is an attribute that can store multiple distinct values for a single entity instance (e.g., skill_set, phone_numbers).
This question belongs to:
Computer
Database Management System (DBMS)
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