Top 50 query optimization Interview Questions
The most frequently asked query optimization questions across all roles and companies, ranked by real interview frequency. Updated daily.
Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.
Revolut
ChimeOptimize a large Apple analytics query using partition pruning, selective indexes, joins, aggregation, and window calculations.
AppleRank Oracle Health EHR clinics by distinct completed patients using aggregation and ROW_NUMBER().
Optimize a PostgreSQL transaction query using selective filtering, aggregation, joins, and execution-plan reasoning.
SoFiAnalyze slow query workloads with filtered aggregation and an owner lookup.
WaymoRank Disney+ Hotstar content by monthly watch time using aggregation, joins, and ROW_NUMBER().
Calculate each location's monthly desk utilization and rolling three-month average using PostgreSQL window functions.
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Build a minimized acyclic automaton for fast repeated Tessian string lookups with O(length) query time.
Tessian