1 SET serveroutput ON;
 2 DECLARE
 3 pnum NUMBER :=1;
 4 BEGIN
 5 while pnum<=10 loop
 6 dbms_output.put_line(pnum);
 7 --变量+1
 8 pnum := pnum+1;
 9 end loop;
10 END;
11 /

 1 SET serveroutput ON
 2 DECLARE
 3 --定义循环变量
 4 pnum number := 1;
 5 BEGIN
 6  LOOP
 7 --退出条件:循环变量大于10
 8   exit WHEN pnum>10;
 9   dbms_output.put_line(pnum);
10 --变量+1
11   pnum := pnum+1;
12 END loop;
13 END;
14 /

 1 SET serveroutput ON;
 2 DECLARE
 3 --定义循环变量
 4 pnum number :=1;
 5 BEGIN
 6 --循环条件
 7 FOR pnum IN 1..10 loop
 8 dbms_output.put_line(pnum);
 9 END loop;
10 END;
11 /