Top 50 large datasets Interview Questions
The most frequently asked large datasets questions across all roles and companies, ranked by real interview frequency. Updated daily.
Explain how to diagnose a slow SQL query and improve its performance.
MicrosoftDetect a heavily skewed join key and produce a deterministically salted join result for more balanced large-scale processing.
DatabricksAggregate qualifying customer events across shards efficiently while joining customer details and excluding low-volume results.
AdobeOptimize a large Apple analytics query using partition pruning, selective indexes, joins, aggregation, and window calculations.
AppleOptimize a PostgreSQL aggregation query over large order data using selective filtering, indexes, and execution-plan analysis.
ToyotaOptimize a PostgreSQL aggregation over large sales tables by filtering early, reducing rows, and ranking top models by region.
ToyotaMeasure user drop-off between consecutive ADP client onboarding steps using PostgreSQL aggregations and joins.
ADPJoin restaurant and delivery data, calculate completed-delivery metrics, and rank restaurants within each city.
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