Top 50 Joins Interview Questions
The most frequently asked Joins questions across all roles and companies, ranked by real interview frequency. Updated daily.
Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.
Biz2Credit
AmeripriseEEltro Cyberchrome PrivateExtract qualifying market observations by venue and price, then return them in chronological order.
Equifax
DPR Construction
RigUpDemonstrate how INNER JOIN and FULL OUTER JOIN handle matching and unmatched rows.
Rocket
NeenOpal
eBayUse filtering and aggregation to summarize completed orders by customer.
Accenture Federal Services
Alten
Bank Of Tokyo-Mitsubishi UFJCalculate month-over-month sales growth for each product category using JOINs and window functions.
Wayfair
REVOLVE
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Find the top 3 customers in each region by transaction volume using joins, aggregation, and window ranking.
JPMorganChase
Silicon Valley Bank
Banco SantanderUse SQL window functions to rank regions by average 2024 yield within each country.
Ernst & Young
KBR
Maximus TechOptimize a customer order aggregation query while preserving date, status, join, and spending filters.
Lam Research
Publicis Sapient
Atlanticus Services