Database Administrator Mock Interview

Master 25 Database Administrator interview questions covering SQL optimization, backup strategies, and security protocols.

Question 3 of 25

What is the difference between a primary key and a unique key?

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William Swansen

William Swansen has worked in the employment assistance realm since 2007. He is an author, job search strategist, and career advisor who helps individuals worldwide and in various professions to find their ideal careers.

This is your first technical question. Technical questions ask you to define terms or processes used in your profession. The best way to respond to a technical question is to first define the term, describe how it is used, and possibly provide an example. Your answer should be brief and to the point. This enables interviewers to ask follow-up questions if they want to explore the topic in more detail or have a specific interest in it.

William Swansen

"The main difference between a primary and a unique key is that a primary key will accept no null values, whereas a unique key will accept just one null value. Additionally, the primary key will create a clustered index automatically when it is defined, whereas the unique key generates a non-clustered index."

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