Users Did A But Not B | Dataford Interview Questions

Networth wants to identify users who viewed the Networth dashboard but did not connect a bank account during the same seven-day reporting period. Write a PostgreSQL query for the reporting period ending 2025-02-16.

For this task, action A is viewed_dashboard and action B is connected_bank_account.

Requirements

Consider events from 2025-02-10 through 2025-02-16, inclusive.
Return users who performed action A at least once and action B zero times during that period.
Include users with no events only when they do not qualify, and return user_id and email ordered by user_id.

Schema

users

Column	Type	Description
user_idPK	INTEGER	Unique Networth user identifier
email	VARCHAR(255)	User email address
signup_date	DATE	Date the user registered

user_actions

Column	Type	Description
action_idPK	INTEGER	Unique action event identifier
user_id	INTEGER	References users.user_id
action_name	VARCHAR(50)	Name of the action performed
occurred_at	TIMESTAMP	Timestamp when the action occurred

Your question is Users Did A But Not B. Start with the requirements and the two tables in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem