一颗巨大的友谊之树

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SQL> set pagesize 2000
SQL> select decode
  2         ( sign(floor(maxwidth*2)-rownum)
  3         , 1, lpad( ' ', floor(maxwidth*2)-(rownum-1))
  4           || rpad( '*', 2*(rownum-1)+1, ' *')
  5         , lpad( '* * *', floor(maxwidth*2)+3))
  6  from all_objects
  7     , (select 20 as maxwidth from dual)
  8  where rownum < floor(maxwidth*2) +5;
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SQL> set heading on
SQL> set feedback on
SQL>

 

 

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