Gaps and islands: every driver's longest working streak
Zoomi pays a loyalty bonus to drivers who work many days in a row. A driver worked on a calendar day if they completed at least one trip that day (status 'Completed', day taken from requested_at). A streak is a run of consecutive calendar days with no missing day in between. A driver may have several streaks, and the bonus is based on the longest one.
Task: for every driver who completed any trip, return driver (name), streak_days, streak_start and streak_end (dates as YYYY-MM-DD) of their single longest streak. If a driver has two streaks of the same length, use the earlier one. Sort by streak_days from high to low, then driver A to Z.
The data you can query
Each table is shown with its column types and the first rows, so you can see exactly what the data looks like.
| id INTEGER | name TEXT | country TEXT |
|---|---|---|
| 1 | Dubai | UAE |
| 2 | Lahore | Pakistan |
| 3 | Singapore | Singapore |
| 4 | Nairobi | Kenya |
| id INTEGER | name TEXT | city_id INTEGER | joined_on TEXT | vehicle_type TEXT |
|---|---|---|---|---|
| 1 | Rashid Al Mansoori | 1 | 2025-09-18 | Economy |
| 2 | Tariq Mehmood | 2 | 2026-02-05 | Economy |
| 3 | Wei Jie Tan | 3 | 2025-09-08 | Comfort |
| 4 | Samuel Kiptoo | 4 | 2025-11-12 | Economy |
| 5 | Hassan Qureshi | 1 | 2025-12-20 | Economy |
| 6 | Priya Raman | 2 | 2025-06-24 | Economy |
Showing the first 6 of 8 rows.
| id INTEGER | name TEXT | home_city_id INTEGER | signup_date TEXT |
|---|---|---|---|
| 1 | Ayesha Khan | 1 | 2026-03-09 |
| 2 | Bilal Okafor | 2 | 2026-02-26 |
| 3 | Chen Silva | 3 | 2026-03-12 |
| 4 | Diego Tanaka | 4 | 2026-03-30 |
| 5 | Elena Weber | 1 | 2026-06-04 |
| 6 | Farid Nguyen | 2 | 2026-05-23 |
Showing the first 6 of 32 rows.
| id INTEGER | rider_id INTEGER | driver_id INTEGER | city_id INTEGER | requested_at TEXT | status TEXT | distance_km REAL | fare_usd REAL | surge REAL | rating INTEGER |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 5 | 1 | 2026-04-06 08:23:01 | Completed | 4 | 6.9 | 1 | 5 |
| 2 | 4 | 8 | 4 | 2026-04-06 10:42:25 | Completed | 13.1 | 9.44 | 1.25 | 5 |
| 3 | 3 | 3 | 3 | 2026-04-06 13:24:49 | Completed | 3.5 | 5.53 | 1 | 5 |
| 4 | 2 | 2 | 2 | 2026-04-06 17:17:07 | Completed | 15.8 | 9.5 | 1.5 | 4 |
| 5 | 1 | 1 | 1 | 2026-04-06 18:25:11 | Completed | 11.8 | 19.35 | 1.25 | 4 |
| 6 | 4 | 8 | 4 | 2026-04-06 21:01:43 | Completed | 16.6 | 9.3 | 1 | 4 |
Showing the first 6 of 548 rows.
Your query runs on SQLite. Write a single SELECT; use LIMIT instead of TOP.
Need a hint?
Subtract the row number (in days) from each date. Days in the same streak land on the same value.
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