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Question : Which of the following statements is true?

Option 1: A Primary key is also a candidate key.

Option 2: Each relation has at least one foreign key.

Option 3: Foreign keys can't have null values.

Option 4: A Primary key is also an alternate key.


Team Careers360 25th Jan, 2024
Answer (1)
Team Careers360 27th Jan, 2024

Correct Answer: A Primary key is also a candidate key.


Solution : The correct answer is A Primary key is also a candidate key.

In a relational database, a candidate key is a set of one or more columns that can uniquely identify a row in a table. A primary key is a specific candidate key that is chosen to uniquely identify rows within a table.

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