Top 10 Users by Activity | Dataford Interview Questions

Your question is Top 10 Users by Activity. Start with the requirements and the two tables on the right.

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Problem

Netsmart Technologies wants to identify the most active users of myAvatar during January 2025. Write a PostgreSQL query that ranks users by recorded activity.

Requirements

Include every user, including users with no qualifying activity.
Count each user's activities from January 1 through January 31, 2025, and calculate the number of distinct active days.
Return the top 10 users, ordered by activity count descending, active days descending, and user_id ascending as a deterministic tie-breaker.

Schema

users

Column	Type	Description
user_idPK	INT	Unique user identifier
full_name	VARCHAR(100)	User's display name
email	VARCHAR(255)	User's email address
role_name	VARCHAR(50)	myAvatar access role

activity_events

Column	Type	Description
event_idPK	INT	Unique activity event identifier
user_id	INT	Associated user identifier
activity_type	VARCHAR(50)	Type of myAvatar activity
occurred_at	TIMESTAMP	Timestamp when the activity occurred