join column to dataframe 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: join tables pandas

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