Problem
Write a SQL query using window functions to compute a rolling 7-day retention rate by cohort at Sift.
Practicing as: Data Scientist interview at SiftHi, I'll play your Sift 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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