Session Overview

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

Domain

SQL

Difficulty

medium

Problem

Product wants a full engagement picture that still includes inactive accounts. For every user, count their sessions and find their longest session_duration_sec, keeping users with no sessions in the output. Return the username, session count, and max duration.

Practice This Problem

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