开始

set serveroutput on;<
     
      >  DECLARE    birthdate DATE;  BEGIN        birthdate:=TO_DATE('2012-05-18','YYYY-MM-DD');      DECLARE         birthdate DATE;      BEGIN         birthdate:=TO_DATE('2012-01-15','YYYY-MM-DD');         dbms_output.put_line('inner date is:' || birthdate);         dbms_output.put_line('outer date is:' || outer.birthdate);      END;            dbms_output.put_line('outer date is:' || birthdate);  END;
     

运行结果：

anonymous block completedinner date is:15-JAN-12outer date is:18-MAY-12outer date is:18-MAY-12

 

结束