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下降()隻刪除列的特定數據幀實例。所以如果你有:val new_ddf =地區指定基金。加入(up_ddf,“名字”)然後在new_ddf兩列ddf.name up_ddf.name。val new_ddf =地區指定基金。加入(up_ddf,“名字”).drop (up_ddf.col(“南…

地區指定基金=地區指定基金。加入(up_ddf ddf.name = = up_ddf.name) .drop (up_ddf.name)