SQL Live Interview
Practice the live SQL screen: define the grain, join without fan-out, and explain how you would check the result before an interviewer asks.
Skills covered: Aggregation and grain · Join cardinality · Window functions · Funnels and retention · Sessionization · Deduplication
Start the free diagnosticNo account is needed for free questions.
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Free diagnostic
One question to find where you stand.
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30-minute practice
Free questions that fit in half an hour.
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3-day plan
Two questions a day, easier first.
Day 1
Day 2
Day 3
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7-day plan
Two questions a day, easier first.
Day 1
Day 2
Day 3
Day 4
Day 5
Day 6
Day 7
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Final timed simulation
Answer under interview conditions: no hints, one sitting.
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