Database Administrator Mock Interview

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

Question 18 of 25

How do you implement one to one, one to many, and many to many relationships while designing tables?

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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.

You probably recognize this as an operational question. Operational questions help the interviewer understand how you go about performing the duties associated with this role. Like technical questions, operational questions should be answered directly and briefly. You should also be prepared for follow-up questions.

William Swansen

"One-to-one relationships are defined as one record in a table being associated with one and only one record in another table. One-to-many relationships are established by associating a single record in one table with multiple records in another table. This requires the use of primary and foreign keys. Many-to-many relationships associate several records in one table with several records in another table. An example of this is a table full of customer names associated with a table full of products they can purchase. Again the use of primary and foreign keys as required. This type of relationship is also facilitated through the use of a join table."

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