--乘法口诀--
select a.rn,
substr(max(sys_connect_by_path(
case when a.rn*b.rn>=10 then
substr(translate(b.rn||'*'||a.rn||'='||a.rn*b.rn,'1234567890*=','一二三四五六七八九十'),1,
case when mod(a.rn*b.rn,10)=0 or a.rn*b.rn>20 then 3 else 2 end)||'十'||
translate(mod(a.rn*b.rn,10),'1234567890','一二三四五六七八九')
else translate(b.rn||'*'||a.rn||'='||a.rn*b.rn,'123456789=*','一二三四五六七八九得')end
,'，')),2) 口诀
from(select rownum rn from all_objects where rownum<=9)a,
(select rownum rn from all_objects where rownum<=9)b
where a.rn>=b.rn
connect by prior a.rn=a.rn
and prior b.rn=b.rn-1
start with b.rn=1
group by a.rn
order by 1