大牛写的这两段SQL实在是太销魂了，实在是忍不住要转载过来，留着以后慢慢看，太牛了……
with a as (select distinct round(a.x + b.x) x,round(a.y + b.y) y from
(select (sum(x) over(order by n)) x,
round(sum(y) over(order by n)) y
from (select n, cos(n/30 * 3.1415926)*2 x,
sin(n/30 * 3.1415926) y
from (select rownum - 1 n from all_objects where rownum <= 30 +30))) a,
(select n, (sum(x) over(order by n)) x,
round(sum(y) over(order by n)) y
from (select n,
cos( m /3 * 3.1415926) * 2 * 15 x,
sin( m /3 * 3.1415926)* 15 y
from (select case when rownum <= 2 then 3
when rownum = 3 then -2 else -6 end m, rownum - 1 n
from all_objects where rownum <= 5))) b
)
select replace(sys_connect_by_path(point, '/'), '/', null) star
from (select b.y, b.x, decode(a.x, null, ' ', '*') point
from a,
(select *
from (select rownum - 1 + (select min(x) from a) x
from all_objects
where rownum <= (select max(x) - min(x) + 1 from a)),
(select rownum - 1 + (select min(y) from a) y
from all_objects
where rownum <= (select max(y) - min(y) + 1 from a))) b
where a.x(+) = b.x
and a.y(+) = b.y)
where x = (select max(x) from a)
start with x = (select min(x) from a)
connect by y = prior y
and x = prior x + 1;
* * * * * * * * * * * * * * * * * *
* * * * * * * * * * * *
* * * * * * * * * * * *
* * * * * *
** *** *** **
* * * * * *
* * * * * *
* * * * * *
* * * * * *
* * * * * *
* * * * * *
* * * * * *
* * * * * *
* * * * * * * * * * * * * *
* * * * * * * * * * * * * *
* * * * * * * * * * * * * *
** * *** * * *** * **
* ** * * *** * * ** *
** * * * ** ** * * * * ** ** * * * **
* * * * * * * * * * * * * * * * * *
* * * *
* * * *
* * * *
* * * *
* * * *
* * * *
* * * *
* * * *
* * * *
** *** **
* * * *
** * * ** ** * * **
* * * * * * * * * * * *
with a as (
select distinct round(sum(x) over(order by n)) x,
round(sum(y) over(order by n)) y
from (select n,
cos(trunc(n / 20) * (1-1/5) * 3.1415926) * 2 x,
sin(trunc(n / 20) * (1-1/5) * 3.1415926) y
from (select rownum - 1 n from all_objects where rownum <= 20 * 5))
)
select replace(sys_connect_by_path(point, '/'), '/', null) star
from (select b.y, b.x, decode(a.x, null, ' ', '*') point
from a,
(select *
from (select rownum - 1 + (select min(x) from a) x
from all_objects
where rownum <= (select max(x) - min(x) + 1 from a)),
(select rownum - 1 + (select min(y) from a) y
from all_objects
where rownum <= (select max(y) - min(y) + 1 from a))) b
where a.x(+) = b.x
and a.y(+) = b.y)
where x = (select max(x) from a)
start with x = (select min(x) from a)
connect by y = prior y
and x = prior x + 1;
*
* *
* *
* *
** **
* *
* *
* * * * * * * *** * * * *** * * * * * * *
** * * **
** * * **
* * * *
** * * **
** * * **
* * * * * *
* * * *
* * * * * *
* * * * * *
* * * *
** * * **
* *
-The End-