我想为扑克手的组合创建一个查找表. 7卡板中有1.13亿种不同的手部组合.
如果我给每张卡片说一个数字(1-52)并希望将每个可能的组合存储在表格中,那么最好的方法是什么呢?我希望它快速查找,所以如果我有一只手13,18,1,51,38,8,49,我可以搜索表中的行.
我可以将每张卡存储在它自己的列中,如下所示:
poker_hands (id,card1,card2,card3,card4,card5,card6,card7)
或者我可以为7张牌创建某种哈希值,例如:
$string= md5($card1 . $card2 . $card3 . $card4 . $card5 . $card6. $card7);
然后用它来查找手
poker_hands (id,hash)
解决方法
首先创建一个从1到52的数字列表.您可以这样做:
create table numbers as select 1 as n union all select 2 union all . . .;
或者,从已存在的表中:
create table numbers as select (@rn := @rn + 1) as n from t limit 52;
然后,使用交叉连接创建组合:
create table hands as select n1.n as card1,n2.n as card2,n3.n as card3,n4.n as card4,n5.n as card5,n6.n as card6,n7.n as card7 from numbers n1 cross join numbers n2 cross join numbers n3 cross join numbers n4 cross join numbers n5 cross join numbers n6 cross join numbers n7;
编辑:
如果卡片应该不同,那么放入适当的条件:
create table hands as select n1.n as card1,n7.n as card7 from numbers n1 join numbers n2 on n2.n not in (n1.n) join numbers n3 on n3.n not in (n1.n,n2.n) join numbers n4 on n4.n not in (n1.n,n2.n,n3.n) join numbers n5 on n5.n not in (n1.n,n3.n,n4.n) join numbers n6 on n6.n not in (n1.n,n4.n,n5.n) join numbers n7 on n7.n not in (n1.n,n5.n,n6.n);
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