Problem
Write a SQL query to calculate month-over-month changes in delivery performance using window functions.
Practicing as: Business Analyst interview at Dhl Supply ChainHi, I'll play your Dhl Supply Chain 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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