while循环

create or replace procedure while_test(start_in int,end_in int) is
init_a int :=start_in;
begin
while (init_a <= end_in)
loop
dbms_output.put_line(init_a);
init_a:=init_a+1;
end loop;
end while_test;

 while循环和简单循环很类似，区别在于while循环每次循环之前检查是否满足终止条件