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SQL Window Trends in Telemetry
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SQL Window Trends in Telemetry

MediumSQL · PostgreSQL

Problem

How would you use SQL window functions to compare daily, weekly, and rolling trends in autonomous vehicle telemetry at May Mobility?

Use the provided telemetry and vehicle records. Return trend metrics for active vehicles with telemetry recorded during the sample period.

Output

  1. One row per active vehicle and service date
  2. Columns: vehicle_id, service_date, daily_miles, weekly_miles, rolling_7_day_avg_miles
  3. Sort by vehicle_id, then service_date ascending

Schema

vehicles
ColumnTypeDescription
vehicle_idPKINTUnique May Mobility autonomous vehicle identifier
vehicle_nameVARCHAR(100)Human-readable vehicle name
modelVARCHAR(50)Vehicle model
statusVARCHAR(20)Current operating status
telemetry_readings
ColumnTypeDescription
event_idPKINTUnique telemetry event identifier
vehicle_idINTVehicle associated with the telemetry event
recorded_atTIMESTAMPTimestamp when telemetry was recorded
distance_milesDECIMAL(8,2)Distance traveled during the telemetry interval
disengagement_countINTNumber of autonomous-mode disengagements
route_nameVARCHAR(100)May Mobility service route name
Tablesvehiclestelemetry_readings
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