pd.merge(product,customer,on='Product_ID',how='right')pd.merge(product,customer,on='Product_ID',how='right')مصادر
https://www.analyticsvidhya.com/blog/2020/02/joins-in-pandas-master-the-different-types-of-joins-in-python/#:~:text=Left%20Join%20in%20Pandas,-Now%2C%20let's%20say&text=Left%20join%2C%20also%20known%20as,columns%20in%20the%20right%20dataframe.