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.
Task A reporting query at a commerce platform summarizes recent orders for active customers, but the production version is slow. Write a PostgreSQL query t...
Optimize a PostgreSQL reporting query by reducing scanned rows, preserving unmatched records, and selecting the latest related review efficiently.
Tata Consultancy Services (North America)PPriority Technology Holdings, LLC
ZillowClassify database tables by read demand, write pressure, and index maintenance cost.
Citi
IBMSuggest practical ways to speed up joins on large tables and identify the join pattern that will scale better.
Amazon Web ServicesExplain how to reduce latency for a query under heavy multi-tenant load.
SWIFT
FilevineOptimize a slow PostgreSQL query on a large dataset by choosing better filters, joins, and indexes.
CitiOOptimoveTThoucentricFind the second-highest distinct salary and optimize retrieval for millions of employee records using indexing.
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Write a PostgreSQL join that preserves all orders and clearly classifies NULL and unmatched customer keys.
Pattern
Swiggy
Quantiphi