MAX( ) in pandas

Posted by Kevin

Selecting the maximum value of column from a SQL table, translated to Python's pandas.

Selecting a single column's maximum value

In SQL:

SELECT 
  MAX(column_1) 
FROM 
  table;

In pandas:

table['column_1'].max()

Selecting the maximum of multiple columns

In SQL:

SELECT 
  MAX(column_1), 
  MAX(column_2) 
FROM 
  table;

In pandas:

table
    .agg({'column_1': ['max'], 'column_2': ['max']})

Selecting the maximum of columns with an alias

In SQL:

SELECT 
  column_1, 
  MAX(column_2) AS max_alias_1, 
  MAX(column_3) AS max_alias_2 
FROM 
  table 
GROUP BY 
  column_1;

In pandas:

table 
    .groupby('column_1') 
    .agg(max_alias_1=('column_2', 'max'), max_alias_2=('column_3', 'max'))

References