Full Year Pivot Using Oracle

A quick example of a full year pivot using Oracle

select 
  * 
FROM 
  (
    select 
      account_no, 
      to_char(
        trunc(some_date_column, 'MONTH'), 
        'MON YYYY'
      ) as transaction_month 
    from 
      some_table 
    where 
      trunc(some_date_column, 'YEAR') = '01-jan-2018'
  ) PIVOT (
    count(transaction_month) for transaction_month in (
      'JAN 2018', 'FEB 2018', 'MAR 2018', 
      'APR 2018', 'MAY 2018', 'JUN 2018', 
      'JUL 2018', 'AUG 2018', 'SEP 2018', 
      'OCT 2018', 'NOV 2018', 'DEC 2018'
    )
  )