DECLARE
   str Varchar(10);-- 定义一个字符串变量str
BEGIN
   for i in 1 .. 10000000 loop
      -- INSERT INTO FW_TEST(NAME) VALUES('bbb' + i);DECODE('1','','',DECODE('2','','',DECODE('3','','','2'||'3'))) NVL2('1',NVL2('2',NVL2('3','2'||'3',''),''),'')
      SELECT DECODE('1','','',DECODE('2','','',DECODE('3','','','2'||'3'))) AS str INTO str FROM dual;-- 把查询出来的值赋值给str
       sys.dbms_output.put_line(str || i);-- 打印该字符串
   end loop;
   commit;
END;
/

set   serveroutput   on   size   10000000