[GENERAL] abs() does not exists..

[mazzo]

Hi all..i'm trying to create a trigger that fires before i insert a value into a column and if the value i insert is negative, it will change it to positive... I was trying with:   create trigger postv before insert on my_table for each row execute procedure abs (column);   But this doesn't seem to work and gives me the error i wrote in the subject...   Can anyone help me out please..?? Sorry if i post here but i looked on deja.com but i didn't find anything..   Thanks in advance..