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全部綜合運用!

就是這個!現在該把你學到的一切拿來實戰。你公司的 CEO 想要一個儀表板,能深入檢視各個充電站據點的整體指標,包括像是耗用能源與充電成本等資料。在建立這個儀表板之前,你需要先建立一個資料集,把這些資訊整理出來。

本練習屬於課程

Snowflake 的 Window Functions

檢視課程

練習說明

  • 針對特定 charging_station_location,依 energy_consumed 由大到小為每次充電工作提供排名。
  • charging_station_location 產生 charging_cost 的「累計總和」。
  • 建立一個視窗框架,使用「前兩筆」與「後兩筆」工作,計算各 charging_station_locationenergy_consumed「移動平均」。

動手互動練習

試著完成這個範例程式碼,體驗一下這個練習。

SELECT
    charging_station_location,
    TO_DATE(charging_start_time),
    charging_cost,
    energy_consumed,
	
    -- Provide a ranking for each charging session based on energy consumed, from greatest to least
    ___() OVER(
        PARTITION BY charging_station_location
        ORDER BY ___
    ) AS rank_energy_consumed,
	
    -- Generate a "running total" of charging costs by charging station location
    SUM(___) OVER(
        ___ ___ ___
        ORDER BY charging_start_time
        ROWS BETWEEN ___ ___ AND ___ ___
    ) AS running_total_charging_cost,
	
    -- Build a window frame using the two preceding and two following sessions to find a moving average of energy consumed
    ___() OVER(
        PARTITION BY ___
        ORDER BY charging_start_time
        ROWS BETWEEN ___ ___ AND ___ ___
    ) AS moving_average_energy_consumed

FROM ELECTRIC_VEHICLES.charging
WHERE energy_consumed IS NOT NULL
ORDER BY charging_station_location, charging_start_time;
編輯並執行程式碼