join dataframes python 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')

Example 5: join to dataframes pandas

>>> df.join(other.set_index('key'), on='key')
  key   A    B
0  K0  A0   B0
1  K1  A1   B1
2  K2  A2   B2
3  K3  A3  NaN
4  K4  A4  NaN
5  K5  A5  NaN

Example 6: join tables pandas

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