PL/SQL中什么变量必须定义？它属于强类型语言还是弱类型语言

Question

declare

begin
for i in 0..5 loop
for k in 1..i loop
dbms_output.put(' ');
end loop;

for j in 1..11-2*i loop
dbms_output.put('*');

end loop;
dbms_output.put_line('');
end loop;
end;

i,j,k都不必先申明再使用

declare
pename emp.ename%type;
pdname dept.dname%type;
cursor cur_info is select ename,dname from emp,dept where emp.deptno = dept.deptno;
begin
open cur_info;
loop
fetch cur_info into pename,pdname;
exit when cur_info%notfound;
dbms_output.put_line('员工姓名：'||pename||' 部门名称：'||pdname);
end loop;
close cur_info;

end;

在这里pename和pdname必须要申明

求解答！！

Answer 1

没有个大神给点提示吗