ระบุเครื่องชาร์จที่มีประสิทธิภาพต่ำ

SELECT
    user_id,
    TO_DATE(charging_start_time), 
    charging_station_location,
    charging_rate,
	
    -- Find the average charging rate, by charging station location
  	-- using a window frame between the first row and current row
    ___(___) OVER(
        PARTITION BY ___
        ORDER BY charging_start_time
        ROWS BETWEEN ___ ___ AND ___ ___
    ) AS running_average_charging_rate,
	
    -- Count the number of records by charging station location
    ___(*) OVER(
        PARTITION BY charging_station_location
      	
      	-- Create a window frame between the current row and the 
      	-- last row, ordered by charging start time
        ORDER BY ___
        ROWS BETWEEN ___ ___ AND ___ ___
      
    ) AS remaining_charges

FROM ELECTRIC_VEHICLES.charging
ORDER BY charging_station_location, charging_start_time;