SELECT title, director, appearance, fee, 0.95*fee AS newfee,
fee-newfee, duration
from hvkkvi.videos
where sysdate-appearance> 5*365
UNION
SELECT title, director, appearance, fee, 0.9*fee AS newfee,
fee-newfee, duration
from hvkkvi.videos
where sysdate-appearance< 5*365
Itt a newfee-re miért mondja, hogy invalid identifier? 
I am having fun staying poor.
