打印五環和五角星的SQL代碼
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??? 大牛寫的這兩段SQL實在是太銷魂了，實在是忍不住要轉載過來，留著以后慢慢看，太牛了……
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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;
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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;
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