Problem
Write a SQL query using window functions to calculate each customer's 7-day rolling average purchase amount.
Practicing as: Data Scientist interview at Retina AIHi, I'll play your Retina AI interviewer for the Data Scientist role. Candidates describe these interviews as often stressful and moderately difficult, so expect me to be direct and to the point. Take your time with the question above and answer like we're in the room.
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