Oracle TRIGGER to set 'RESTRICTION' column on table 'LRESTRICTION' to 'YES' based on 'LAMOUNT' column of table 'LMEMBER'

Im trying to create a trigger on oracle sql that updates the \'RESTRICTION\' column of \'LRESTRICTION\' table to display \'YES\' or \'NO\' based on the value of \'LAMOUNT\' column of \'LEMBER\' table