Top 50 complex queries Interview Questions
The most frequently asked complex queries questions across all roles and companies, ranked by real interview frequency. Updated daily.
Demonstrate window functions by ranking active employees by salary within each department.
Johnson & Johnson
AvidXchange
CRIFRank product categories by net sales using multiple joins, CTEs, and window functions.
WalmartOptimize a PostgreSQL reporting query by reducing intermediate rows, using appropriate joins, and calculating monthly performance efficiently.
The Cigna Group
ElemicaOptimize a PostgreSQL reporting query using selective filtering, aggregation, indexing strategy, and execution-plan reasoning.
CapgeminiDDeltaX
Melaleuca: The WellnessRewrite a slow policy-performance query to reduce repeated work while preserving broker-level results.
Write and explain a query that summarizes analyst query performance by dataset and ranks analysts by success rate.
Autodesk
PCS Global Tech
Gro IntelligenceAnalyze Docker organization activity by combining membership and event data into filtered operational metrics.
Coinbase
Plaid
DockerRewrite a slow PostgreSQL reporting query to reduce scanned rows, avoid join multiplication, and return accurate monthly site metrics.
Continental FinanceCapgemini
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