Answers for ".join in pandas"

pandas left join

df.merge(df2, left_on = "doc_id", right_on = "doc_num", how = "left")

join on column pandas

# df1 as main df and use the feild from df2 and map it into df1

df1.merge(df2,on='columnName',how='left')

join tables pandas

In [99]: result = left.join(right, on=['key1', 'key2'], how='inner')

joins in pandas

pd.merge(product,customer,left_on='Product_name',right_on='Purchased_Product')

join tables pandas

In [88]: result = left.join(right, how='inner')