Both Arms of the Trial

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

Domain

SQL

Difficulty

easy

Seniority

L3

Problem

Our experimentation platform logs one record per user assignment, tagged with the feature test and the variant the user landed in. Find the tests that routed more assignments to 'variant_a' than to 'variant_b', listed alphabetically by test name.

Summary

Some features were tried both ways.

Practice This Problem

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