oracle函数赋值判断语句

Question

作为一个新手自己定义了个函数发现老是有一个错误：
create or replace function gd2(account in gt.account%TYPE,password in GT.PASSWORD%TYPE)
return VARCHAR2
is
begin
if(gd(account ,password)==1）then
dbms_output.put_line('登陆成功');
else
dbms_output.put_line('不存在该账户');
end if;
end;
错误是：错误(5,25): PLS-00103: 出现符号 "="在需要下列之一时： . ( ) , * % & = - + < / > at in is mod remainder not rem => <> or != or ~= >= <= <> and or like like2 like4 likec as between || multiset member submultiset
就是那个if的判断框里出错，我改为gd(account ,password)：=1和gd(account ,password)：==1都不行，这个该怎么办？

Answer 1

 if(gd(account ,password)==1）then
 改成
 if(gd(account ,password)=1）then