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.
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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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