Classify Power Users by Activity | Dataford Interview Questions

Your question is Classify Power Users by Activity. Start with the requirements and the two tables on the right.

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Problem

StreamWave wants to segment users by recent activity. Write a PostgreSQL query to identify power users and compare them with casual users over the last 30 days.

A user is a power user if they completed 5 or more sessions in the last 30 days. Otherwise, they are a casual user. Only include users whose account status is active.

Requirements

Count each active user's completed sessions in the last 30 days.
Classify users as power_user or casual_user using the 5-session threshold.
Return one row per segment with:
- number of users
- average completed sessions per user
- average total minutes watched per user
Include active users with zero completed sessions as casual_user.
Order results by user_segment.

Schema

users

Column	Type	Description
user_idPK	INT	Primary key for each user
user_name	VARCHAR(100)	Full name of the user
signup_date	DATE	Date the user created the account
status	VARCHAR(20)	Account status such as active or inactive

sessions

Column	Type	Description
session_idPK	INT	Primary key for each session
user_id	INT	User who started the session
session_date	DATE	Date of the session
duration_minutes	INT	Length of the session in minutes
session_status	VARCHAR(20)	Status of the session such as completed or cancelled