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Optimize Slow SQL Aggregation

Hard
SQL & Data Manipulationperformancequery optimizationAggregations

Problem

How would you optimize a slow-running SQL query that aggregates millions of rows of client data?

Practicing as: Business Analyst interview at Genpact

Hi, I'll play your Genpact 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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