Ich habe zwei Datenrahmen. Beispiele: df1: Date Fruit Num Color 2013-11-24 Banana 22.1 Yellow 2013-11-24 Orange 8.6 Orange 2013-11-24 Apple 7.6 Green 2013-11-24 Celery 10.2 Green df2: Date Fruit Num Color 2013-11-24 Banana 22.1 Yellow 2013-11-24 Orange 8.6 Orange 2013-11-24 Apple 7.6...