Largest A/B Test by Participants

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

Domain

SQL

Difficulty

medium

Seniority

L3

Problem

The data science team is identifying which A/B test drew the widest audience. Which test had the most unique participants? Return the test name and count for the top one.

Summary

The biggest experiment ever run.

Practice This Problem

Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a real database and grades it automatically.