Consecutive Login Days SQL | Dataford Interview Questions

Given a user activity table, write a query to find consecutive days of logins.

Treat multiple logins by the same user on one calendar date as a single login day. Return only streaks containing at least two consecutive calendar days.

Output

One row per user login streak.
Columns: user_id, streak_start, streak_end, and consecutive_days.
Sort by user_id, then streak_start ascending.

Schema

user_activity

Column	Type	Description
activity_idPK	INT	Unique activity event identifier
user_id	INT	Identifier of the user who logged in
login_at	TIMESTAMP	Timestamp when the login activity occurred

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