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Updated weekly · Last refresh Sep 13

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.

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1
SQL & Data ManipulationStart here. 46 questions · ~461 min
Top Users by Recent Transaction VolumeMedium
Practice
Recently asked

Find the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.

Data Analysisquery optimizationsqlTTier 1 BankRevolutChime
Optimize Slow Query with IndexingHard
Practice

Optimize a large Apple analytics query using partition pruning, selective indexes, joins, aggregation, and window calculations.

database optimizationindexinglarge datasetsApple
Top Clinics by Patient VolumeMedium
Practice

Rank Oracle Health EHR clinics by distinct completed patients using aggregation and ROW_NUMBER().

Window Functionsquery optimizationsqlOOracle Health
Optimize Slow Query on TransactionsMedium
Practice

Optimize a PostgreSQL transaction query using selective filtering, aggregation, joins, and execution-plan reasoning.

Performance Tuningdatabase optimizationlarge datasetsSoFi
Optimizing Slow QueriesMedium
Practice

Analyze slow query workloads with filtered aggregation and an owner lookup.

Performance Tuningdatabase optimizationdata processingWaymo
Top Content by Watch TimeMedium
Practice

Rank Disney+ Hotstar content by monthly watch time using aggregation, joins, and ROW_NUMBER().

Window FunctionsData Analysisquery optimizationDDisney+HotStar
Rolling Desk Utilization With SQLMedium
Practice

Calculate each location's monthly desk utilization and rolling three-month average using PostgreSQL window functions.

Date FunctionsData Analysisquery optimizationWeWork
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2
More topics4 questions · ~40 min
Fast Lookup With Slow BuildHard
Practice

Build a minimized acyclic automaton for fast repeated Tessian string lookups with O(length) query time.

query optimizationTessian
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