create function bigdate(first date, last date ) returns date
begin 
	declare datetemp date;
	set datetemp = last;
	if first > last then
			set datetemp = first;
	end if;
	return datetemp;
end

create function smalldate(first date, last date ) returns date
begin 
	declare datetemp date;
	set datetemp = last;
	if first < last then
			set datetemp = first;
	end if;
	return datetemp;
end