Riders Taking a Second Trip Within 7 Days

SQL practice question · Hard · Analytics · Uber

Consider only trips with status 'completed'. Order each rider's completed trips by `requested_at` (ties by `trip_id`). A rider *repeats* if their 2nd completed trip was requested at most 7 days (7 * 24 hours, inclusive) after the 1st. Per `signup_city` (only cities with at least one rider who completed a trip) return `signup_city`, `riders_with_trip`, `repeat_7d`, `repeat_pct` (ROUND 1). Order by `repeat_pct` DESC, then `signup_city`.

Table: riders

Schema of riders
ColumnType
rider_idINTEGER
signup_cityTEXT
Sample rows of riders
rider_idsignup_city
1Delhi
2Delhi
3Delhi
4Mumbai
5Mumbai
6Goa

Table: rider_trips

Schema of rider_trips
ColumnType
trip_idINTEGER
rider_idINTEGER
requested_atTIMESTAMP
statusTEXT
Sample rows of rider_trips
trip_idrider_idrequested_atstatus
112026-09-01 08:00:00completed
212026-09-03 09:00:00completed
322026-09-01 10:00:00completed
422026-09-05 10:00:00cancelled
522026-09-20 10:00:00completed
632026-09-02 10:00:00completed
742026-09-02 11:00:00completed
842026-09-09 11:00:00completed
Expected output on the sample data
signup_cityriders_with_triprepeat_7drepeat_pct
Mumbai2150
Delhi3133.3

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