Problem
Given a table of ad impressions and a table of user clicks, write a query to find the click-through rate (CTR) grouped by country and device type on Snapchat.
Practicing as: Business Analyst interview at SnapHi, I'll play your Snap interviewer for the Business Analyst role. Candidates describe these interviews as mixed and moderately difficult, so expect me to be professional and fair. Take your time with the question above and answer like we're in the room.
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