Dear All,
Test for Leap Years
select year,
decode( mod(year, 4), 0,
decode( mod(year, 400), 0, 'Leap Year',
decode( mod(year, 100), 0, 'Not a Leap Year', 'Leap Year')
), 'Not a Leap Year'
) as leap_year_indicator
from my_table
Have a pleasant time