Top 50 Data Wrangling Interview Questions
The most frequently asked Data Wrangling questions across all roles and companies, ranked by real interview frequency. Updated daily.
Replace missing sales fields with defined defaults and return a consistently ordered dataset.
University of Minnesota
The Home Depot
NationwideRewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.
Biz2Credit
AmeripriseEEltro Cyberchrome PrivateDemonstrate how INNER JOIN and FULL OUTER JOIN handle matching and unmatched rows.
Rocket
NeenOpal
eBayAudit claims for missing members, invalid amounts, and payment totals that exceed billed amounts.
Healthfirst (New York)
PhysicsXBBritvic Soft DrinksAggregate project usage to identify frequently used data analysis tools and compare their hours and ratings.
Limeade
LaSalle Network
E15 GroupUse GROUP BY and HAVING to find duplicate patient records in a Johns Hopkins Medicine dataset.
Emerson
CareDx
SberbankAggregate monthly sales by product category and use LAG to calculate month-over-month changes.
Total Wine & More
Inc.
Benjamin MooreSign up to see every question
Create a free account to unlock this list and practice real interview questions.
Locate the first differing execution snapshot between actual and expected traces using a linear scan.
QTS
University of Wisconsin-Madison
The Select Group