PL/SQL 中如何正确选择游标类型（1）

declare
cursor c is select tname from tab ; 
l_tname varchar2(64);
begin 
open c ; 
loop
    fetch c into l_tname ;
    exit when c%notfound ; 
    dbms_output.put_line(l_tname);
end loop;
close c;
end;
/
..
..

declare
cursor c is select tname from tab ;
l_tname_array dbms_sql.varchar2_table;
begin
open c ;
fetch c bulk collect into l_tname_array ;
for i in 1 .. l_tname_array.count loop
    dbms_output.put_line(l_tname_array(i) );
end loop;
close c;
end;
/
..
..