EXIN SQL Foundation Practice Questions - EXIN Databases En SQL Foundation Exam

What is the primary characteristic of a Primary Key in a relational database table?

It uniquely identifies each row in the table and cannot contain NULL values. It establishes a link to the primary key of another table and allows NULL values. It allows duplicate values as long as the column data type is an integer. It automatically creates a non-clustered index and permits duplicate entries.

Correct Answer:

It uniquely identifies each row in the table and cannot contain NULL values.

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