declare
num number;
begin
num:=0;
for .... loop
num:=num+1;
if num=2 then exit;
for ....loop
for ... loop
end loop;
end loop
end loop;
end;
/
num number;
begin
num:=0;
for .... loop
num:=num+1;
if num=2 then exit;
for ....loop
for ... loop
end loop;
end loop
end loop;
end;
/
不会的,看看你写的代码