Driver Longest Active-Day Streak

SQL practice question · Hard · Gaps & Islands · Uber

A driver is *active* on a calendar day if they completed at least one trip that day (several trips on one day still count as one day). For each driver find their longest run of consecutive active days. Return `driver_id`, `longest_streak_days`, `streak_start` (first date of that run, 'YYYY-MM-DD'; if two runs tie, use the earliest one). Order by `driver_id`.

Table: driver_trips

Schema of driver_trips
ColumnType
trip_idINTEGER
driver_idINTEGER
trip_tsTIMESTAMP
Sample rows of driver_trips
trip_iddriver_idtrip_ts
112026-03-01 08:10:00
212026-03-01 18:40:00
312026-03-02 09:00:00
412026-03-03 23:55:00
512026-03-05 07:30:00
612026-03-06 10:00:00
722026-03-01 12:00:00
822026-03-03 12:00:00
Expected output on the sample data
driver_idlongest_streak_daysstreak_start
132026-03-01
222026-03-03

Solve it in the live editor on this page — run on sample data, then submit against hidden tests.

‹ Frequently Bought Together Pairs · Driver Idle Time Between Rides ›

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