Problem
Write a SQL query using window functions to calculate rolling 7-day CTR by campaign and compare it to the prior period for Known reporting.
Practicing as: Data Scientist interview at KnownHi, I'll play your Known 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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