The Company You Keep

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

Domain

SQL

Difficulty

medium

Seniority

L5

Problem

On our experimentation platform we only care about users who share an experiment with at least one other user. For each Friday, count how many sessions those users ran, listed from the earliest date.

Summary

Only experiments with a crowd count. Find the Friday sessions they drove.

Practice This Problem

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