What is not true about primary key?

Which is not true about primary key *?

Primary key may not contain duplicate values.

Which is true about primary key?

A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values. A table can have only one primary key, which may consist of single or multiple fields.

Which of the following is not a primary key?

6. Which one of the following cannot be taken as a primary key? Explanation: Street is the only attribute which can occur more than once.

Which of the statement is incorrect about primary key?

Option d statement is incorrect. Because Primary key name and the foreign key name need not be same, they can have different names. Every table can have a primary key. And the primary key can be single field or a combination of fields.