Problem
Write a SQL query using window functions to identify the top three customer accounts by SMS volume for each region over the last quarter at Twilio.
Practicing as: Data Analyst interview at TwilioHi, I'll play your Twilio interviewer for the Data Analyst 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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