join on index pandas code example

Example 1: 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')

Example 2: pandas left join

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

Example 3: joins in pandas

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

Example 4: joins in pandas

pd.merge(product,customer,on='Product_ID')