Dataford
Interview QuestionsInterview GuidesExperiencesMock InterviewsPricing
Get started

Handling Missing Values in Retail Data

MediumSQL & Data Manipulation00:00
Practice interviewer
In session
5 left
00:00

Your question is Handling Missing Values in Retail Data. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

You need to log in / sign up to chat or submit.

Problem

You are given NIKE retail reporting tables with missing values in product, order, and inventory fields. Explain how you would investigate the missingness in SQL, decide whether to preserve, filter, default, or impute values, and ensure the logic is reliable for dashboard consumers.

What This Tests

  • Profiling missing values with SQL
  • Classifying nulls with business logic
  • Detecting join-driven missingness
  • Choosing safe reporting defaults

Interview Context

The interviewer is looking for a SQL-first data wrangling answer, not a generic machine learning discussion about imputation. Focus on how you would inspect the data, encode rules in SQL, and communicate trade-offs to dashboard users.