How do I trim date in PLSQL?

select db||sysdate
(this is the component where I want only 08 from the date)
from gct;

to_char(sysdate, 'YY')

extract(YEAR FROM DATE '2008-12-24')

mod(extract(YEAR FROM DATE '2008-12-24'), 100)

select db||to_char(sysdate,'YY')
from gct;