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SELECT
	user_id,
    charging_station_location,
	TO_DATE(charging_start_time),
    charging_duration,

    -- Find the running average of charging duration
    ___ OVER(
      	-- Partition the results by charging_station_location
      	___

        -- Sequence the results by charging start time in ascending order
        ORDER BY ___

        -- Create the window of records to always be between the 
      	-- first row and the current row
        ___

    ) AS running_average
FROM ELECTRIC_VEHICLES.charging;