CREATE TABLE Lessons (vehicle_id VARCHAR)
CREATE TABLE Vehicles (vehicle_id VARCHAR, vehicle_details VARCHAR)

What is the id and detail of the vehicle used in lessons for most of the times?
SELECT T1.vehicle_id, T1.vehicle_details FROM Vehicles AS T1 JOIN Lessons AS T2 ON T1.vehicle_id = T2.vehicle_id GROUP BY T1.vehicle_id ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T1"."vehicle_id", "T1"."vehicle_details" FROM "Vehicles" AS "T1" JOIN "Lessons" AS "T2" ON "T1"."vehicle_id" = "T2"."vehicle_id" GROUP BY "T1"."vehicle_id" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1