Feature Quality by Source

A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant feedback.

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

Find sources in the ML feature store that have both high-null features (null percentage above 20) and low-null features (null percentage below 2). For each qualifying source, count how many different features fall into each bucket. Include sources even if one bucket is empty.

Summary

Quality varies by source.

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