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Latest Telemetry Event per Vehicle
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Latest Telemetry Event per Vehicle

MediumSQL · PostgreSQL

Problem

Write an SQL query to join vehicle telemetry events with vehicle metadata and return the latest event per vehicle. Use the provided tables. Return only vehicles with matching telemetry, select the event with the greatest timestamp, and use the greatest event ID to break timestamp ties.

Output

  1. One row per vehicle with matching telemetry
  2. Columns: vehicle_id, vin, model, event_id, event_timestamp, event_type
  3. Order by vehicle_id ascending

Schema

vehicle_metadata
ColumnTypeDescription
vehicle_idPKINTInternal vehicle identifier
vinVARCHAR(17)Vehicle identification number
modelVARCHAR(50)Vehicle model name
model_yearINTVehicle model year
assembly_plantVARCHAR(80)Vehicle assembly plant
telemetry_events
ColumnTypeDescription
event_idPKINTUnique telemetry event identifier
vehicle_idINTVehicle associated with the event
event_timestampTIMESTAMPTZTime when the event was recorded
event_typeVARCHAR(40)Telemetry event classification
speed_kphDECIMAL(6,2)Vehicle speed in kilometers per hour
battery_percentDECIMAL(5,2)Battery charge percentage
Tablesvehicle_metadatatelemetry_events
Interviewer

Your question is Latest Telemetry Event per Vehicle. Start with the requirements and the two tables in the Question tab.

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