用sql计算ABCDE*4=EDCBA(这五个数字不重复)

张兴康

--一个五位数字ABCDE*4=EDCBA，这五个数字不重复

1. with a as
   
2. (select level - 1 as x from dual connect by level <= 10)
   
3. select a.x * 10000 + b.x * 1000 + c.x * 100 + d.x * 10 + e.x as y
   
4.   from a a, a b, a c, a d, a e
   
5. where a.x > 0
   
6.    and (a.x * 10000 + b.x * 1000 + c.x * 100 + d.x * 10 + e.x) * 4 =
   
7.        e.x * 10000 + d.x * 1000 + c.x * 100 + b.x * 10 + a.x
   
8.    and (a.x <> b.x)
   
9.    and (a.x <> c.x and b.x <> c.x)
   
10.    and (a.x <> d.x and b.x <> d.x and c.x <> d.x)
    
11.    and (a.x <> e.x and b.x <> e.x and c.x <> e.x and d.x <> e.x);

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1. with t as
   
2. (select level-1 as n from dual connect by level <=10)
   
3. select * from t a,t b, t c,t d,t e
   
4. where to_number(a.n||b.n||c.n||d.n||e.n)*4= to_number(reverse(a.n||b.n||c.n||d.n||e.n)) and a.n<>0

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张兴康

万望 发表于 2016-2-28 23:53
我也是说，大牛