Welcome to your interview.
The question is on your right: SQL Window Functions for Time-Series Stats. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
How do you use SQL window functions to calculate running totals, moving averages, or rank records within partitions?