Understanding and practicing joins, aggregate functions, and subqueries are the key to your success in a coding interview.

There is almost always a SQL portion to any interview in a data-oriented position. Whether you’re interviewing for an analyst, engineering, or data science role, SQL will always creep its way into the coding portion of the process.

Once you nail a few key concepts you can pretty much answer any question, with lots of practice that is. Start with the basics for each of these concepts and work your way up to more difficult problems.

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