Hard SQL interview questions test the advanced problem solving skills expected in many medium and senior level data analyst ...

When you interview for a SQL database administrator job, the interviewer will likely ask a number of questions related to optimizing SQL databases. Be prepared to discuss the different factors that ...

Do you know how to measure the impact on performance of your SQL changes? Do you know which parts of your stored procedures (or batch of SQL statements) you need to optimise? Both of these questions ...