SQL interview questions and answers 💬
SQL server interview questions
If you’re interviewing for a SQL role related to SQL servers, an employer may ask questions to find out the extent of your SQL Server knowledge, here are some example SQL Server interview questions and answers.
What is SQL profiler?
“A SQL server profiler is a tool that helps developers trace, track and troubleshoot problems, giving them a high-level view of the operation of a system. Users create traces to capture data and then use the profiler to store, retrieve and view the results of those traces to repair and troubleshoot issues.”
What are the common performance issues in SQL server?
“There are a few performance issues SQL servers face, some of these are poor queries, slow processing, memory pressure, excessive CPU usage.”
In your answer, show an employer your SQL knowledge is highly advanced, and list a few of the solutions to these issues.
“To troubleshoot a few of these issues, you want to ensure the TempDB database is configured optimally and make sure you’re running index maintenance frequently.”
SQL interview questions for testers
When interviewing for SQL tester-related roles, an employer will want to know the extent of your database testing knowledge and experience, when answering each question, you want to include any experience you’ve had with SQL testing along with examples and what you learnt from each experience.
Here are some example SQL interview questions for testers with example answers.
What is database testing? Why is it important? What is your experience with database testing so far?
“Database testing or back-end testing is checking the schema, tables, triggers of the database by creating complex queries to test the database and check its responsiveness. This type of testing chiefly deals with all the testable items that are generally hidden from the user for viewership. Database testing is highly important to ensure the values that an application is retrieving or storing into the database are accurate.”
What is DBMS? What is your experience with DBMS so far?
“DBMS is a database management system, which is a software package designed to define, manipulate and retrieve data in a database. Some DBMS examples include MySQL, SQL Server, Oracle, FileMaker and Clipper.”
Advanced SQL interview questions
Interviewing for an advanced SQL role? Employers will often set tasks to see how advanced your knowledge is, here are some tips for how to handle SQL based tasks and example SQL interview questions for experienced professionals.
Tell me about a challenging SQL project you worked on
An interviewer will ask this question for multiple reasons, they want to know how advanced your SQL knowledge is, but also how you deal with difficult situations. You want to attend an interview prepared with an example of a SQL project you’ve previously worked on. In your answer include what you learnt from the project, what you enjoyed and what the main challenges were and how you overcame these.
Please talk me through your task
To see how advanced your SQL abilities are, employers may set tasks for you to complete before an interview, often asking you to solve or write SQL queries.
In an interview, an employer may want to discuss your task and understand your reasons behind your query design.
It’s important to attend an interview prepared to talk through your work, spend a few hours before an interview going over your task and justifying your reasons behind making certain decisions.
Other common graduate interview questions and answers
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Whether you’re interviewing for a beginner or advanced SQL role, use our SQL interview questions and answers to prepare for your interviews and confidently showcase your knowledge of the industry and explain why you’re suited to a company’s role.
If you’re applying to graduate SQL roles, you need a standout graduate CV to attract an employer’s attention and secure an interview, visit our CV Hub for CV templates, tips and examples! Find out some of the key skills required for graduate technology jobs.
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