Problem
Given a stream of ad click events, write a SQL query to calculate the rolling 7-day click-through rate per user.
Practicing as: Data Engineer interview at CiscoHi, I'll play your Cisco interviewer for the Data Engineer role. Candidates describe these interviews as mostly positive and moderately difficult, so expect me to be friendly and conversational. Take your time with the question above and answer like we're in the room.
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