Error: PLS-00201: 必须声明标识符 'EVEN'

1、错误描述

Compilation errors for FUNCTION SCOTT.ODDError: PLS-00201: 必须声明标识符 'EVEN'Line: 4Text: Result := not Even(Value);Error: PL/SQL: Statement ignoredLine: 4Text: Result := not Even(Value);

create or replace function Odd(Value in integer) return boolean is     Result boolean;   begin     Result := not Even(Value);    return (Result);   end Odd; 

3、解决办法

create or replace function Even(Value in integer) return boolean is    Result boolean;   begin     Result := (Value mod 2 = 0);     return (Result);   end Even;