Back End Developer Mock Interview
Master 30 Back End Developer interview questions covering APIs, databases, system design, and server architecture.
Question 8 of 30
Can you describe a NoSQL database and how it differs from a relational database?
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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.
Technical questions are defined as questions that ask you to discuss a term, process, or other aspects used in the work you perform. Technical questions will often ask you to compare one concept to another one. When answering this type of question, first define the term or concept, and then make the comparison. Keep your answer direct and to the point, and anticipate a follow-up question which the interviewer will ask to explore the topic in more detail.
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.
"A NoSQL database is a mechanism that allows for the storage and retrieval of data and information. It is similar to a relational database, except a NoSQL database does not depend on tabular relations. A NoSQL database's common elements include key values, graphs, and both column and document orientation."
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A NoSQL database (such as MongoDB) does not organize data into tables with a predefined schema like a relational database (such as Postgres) does. The structure of each record in a NoSQL database can be different and can contain nested data. NoSQL databases cannot be queried using SQL but require a different query structure. NoSQL databases typically do not provide an ACID guarantee, unlike relational databases.
Marcie's Feedback
You've done a great job describing NoSQL databases and how they differ from relational databases. The interviewer will be impressed that you've included examples of each as well (MongoDB and Postgres). Do you have any experience building or using these types of databases? If so, discuss this to further strengthen your answer. Great job!
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