oracle 3大范式 理解

 CREATE OR REPLACE PACKAGE pack3 AS
 FUNCTION fun_calc (num1 NUMBER ,num2 NUMBER ) RETURN  number ;
 function fun_null return varchar2 ;
 procedure p_add (num1 number ,num2 number ) ;

 END ;
 /
 CREATE OR REPLACE PACKAGE BODY pack3 AS
 FUNCTION fun_calc (num1 NUMBER ,num2 NUMBER ) RETURN NUMBER AS
 num3 NUMBER:=0 ;
 BEGIN
     num3 := num1+num2;
     RETURN num3 ;
 END fun_calc;
 function fun_null return varchar2  as
 strmsg varchar2(100) := '我是无参的 function ！'
     begin
     return strmsg ;
     end fun_null;
 procedure p_add (num1 number ,num2 number ) as
     num3 number := 0 ;
     begin
         num3 := num1+num2 ;
     return num1||'+'||num2||'='||num3 ;
     end p_add ;

 END pack3 ;