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SQL Interview Questions for Experienced Professionals Posted on : Jan 25 - 2022

Introduction

If you’re an experienced data scientist looking for a job, you could not have picked a better time. As of right now, many established organizations are looking for data scientists who know their craft inside and out. However, the high demand doesn’t mean that you can, or should jump through hoops and apply for senior positions without a certain skill set. When hiring experienced data scientists, companies expect them to work on the most difficult tasks at hand. These employees should have a good grasp of even the most obscure features so that they can use them when necessary.

It shouldn’t be surprising that when interviewing for senior positions, experienced data scientists tend to get asked much harder questions. Often, when working on a single job for a couple of years, data scientists become very skilled at performing certain repetitive tasks. It's essential for professionals to realize that SQL doesn’t stop and end with their existing knowledge. When it comes to advanced SQL concepts, there may still be some gaps in their knowledge. So it doesn’t hurt to get help for succeeding at your data scientist interview.

SQL is the primary language for managing databases, so performing SQL operations is at the heart of data scientists’ jobs. Most data scientist interviews are arranged to determine a candidate's knowledge of SQL.

The everyday job might not include writing complex queries, but you must show that if such skills are needed, you’re the person capable of doing it. So it shouldn’t be surprising that interviewers ask a diverse set of SQL interview questions to test the candidate’s fluency in SQL.

In this article, we wanted to summarize some of the complex questions and concepts asked in interviews with experienced professionals. Even if you’re confident in your SQL knowledge, it doesn’t hurt to scan the keywords and make sure you’ve got everything covered.

Bare minimum concepts for experienced professionals

CASE / WHEN

 Thoroughly understanding the concept of CASE (and its accompanying When statement) is essential for achieving complete mastery of SQL. A case statement allows us to check certain conditions and return a value based on whether those conditions evaluate as true or false. In combination with clauses, such as WHERE and ORDER BY, CASE allows us to bring logic, conditions, and order into our SQL queries. View More