用sql或者pl/sql语句实现：
*
***
*****
*******
方法有如下:
Select lpad('*',Rownum*2 -1,'*') From dual
Connect By Rownum <5
Select lpad('*',Rownum*2 -1,'*') From all_objects
select rownum ,substr(sys_connect_by_Path(null,'**'),2)
from dual connect by rownum<100
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