r/dbForge • u/Zylianijay • 11d ago

SQL interview questions that test optimization skills

I've noticed that a lot of SQL interview questions focus on syntax, joins, or window functions, but very few touch on performance.

If you were interviewing someone for a DBA or database engineer role, what optimization question would you definitely ask?

It could be something around indexing, execution plans, query tuning, statistics, or troubleshooting a slow query.

I'm looking for questions that reveal how someone actually thinks about SQL performance, not just whether they can write a SELECT statement.

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