Problem
Given a table of user ad-click events, write a SQL query to calculate the rolling 7-day click-through rate (CTR) for each campaign.
Practicing as: Data Scientist interview at NexxenHi, I'll play your Nexxen 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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