Problem
Write a SQL query to calculate the repeat purchase rate of customers within Sephora's Beauty Insider loyalty program over a six-month period.
Practicing as: Business Analyst interview at SephoraHi, I'll play your Sephora interviewer for the Business 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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