Oracle 选择子查询或创建视图中的内联函数

select  /*+ WITH_PLSQL */ calc from
(
with 
function calculator (m number, r number) return number
is begin
return m * r;
end calculator;
select calculator(3, 2) as calc from dual
);

ORA-06553: PLS-103: Encountered the symbol "end-of-file" when expecting one of the following:

   . ( * @ % & = - + ; < / > at in is mod remainder not rem
    <> or != or ~= >= <= <> and or like like2
   like4 likec between || member submultiset
06553. 00000 -  "PLS-%s: %s"
*Cause:    
*Action:
Error at Line: 4 Column: 1

with function calculator (m number, r number) return number
is begin
return m * r;
end calculator;
select calculator(3, 2) as calc from dual;

CALC  
6