Declare
v_ival number;
i number;
Begin
--Loop循环
v_ival := 0;
loop
exit when v_ival > 3; --循环体
v_ival := v_ival + 1;
dbms_output.put_line('loop循环：' || v_ival);
end loop;
--While循环
v_ival := 0;
while v_ival < 4 loop --循环体
v_ival := v_ival + 1;
dbms_output.put_line('while循环：' || v_ival);
end loop;
--For循环
for v_count in reverse 0 .. 4 loop --reverse递减
dbms_output.put_line('for循环：' || v_count);
end loop;
for t in 1..10 loop
i:=i+t;
dbms_output.put_line('for循环t：' || t);
end loop;
END;