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 ...

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

A common SQL habit is to use SELECT * on a query, because it’s tedious to list all the columns you need. Plus, sometimes those columns may change over time, so why not just do things the easy way? But ...