Find Consecutive Login Activity | Dataford Interview Questions

Your question is Find Consecutive Login Activity. Start with the requirements and the two tables on the right.

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Problem

Ameriprise wants to identify sustained engagement with its client digital experience. Given client login events, write a PostgreSQL query that finds each client's consecutive calendar-day login streaks.

Requirements

Treat multiple logins by the same client on one calendar date as a single active day.
Return every streak of at least two consecutive days, including the client ID, client name, start date, end date, and streak length.
Exclude login records with a missing client ID or login date, and sort results by client ID and streak start date.

Schema

clients

Column	Type	Description
client_idPK	INT	Unique Ameriprise client identifier
client_name	VARCHAR(100)	Client display name

client_logins

Column	Type	Description
login_idPK	INT	Unique login event identifier
client_id	INT	Client associated with the login
login_date	DATE	Calendar date of client activity