Top 50 Data Analyst Interview Questions
The 50 most important questions to prepare for Data Analyst interviews. Questions from real interview reports rank first. Updated daily.
Standardize missing observation fields with fallback values, missingness flags, and ordered output.
Eversource Energy
Cincinnati Children's Hospital
Adtalem Global EducationCalculate month-over-month sales growth for each product category using JOINs and window functions.
Wayfair
REVOLVE
FanaticsRewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.
AmeripriseEEltro Cyberchrome Private
EnergyHubCalculate the monthly spending trends for customers using window functions and joins.
The Home Depot
Aviso
Hewlett Packard EnterpriseExtract qualifying market observations by venue and price, then return them in chronological order.
Equifax
DPR Construction
RigUpAggregate monthly sales totals by product category using JOINs, GROUP BY, and date formatting.
Walgreens
Rev
LatentView AnalyticsDemonstrate how INNER JOIN and FULL OUTER JOIN handle matching and unmatched rows.
Rocket
NeenOpal
eBayFind two indices whose values sum to a target using a hash table in O(n) time.
Barclays
Globallogic
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