SQL生成一柱双色球

数据库环境：SQL SERVER 2005

以前用C/JAVA穷举双色球的所有排列，今天想着换成用SQL实现，只生成一柱双色球。

简单说下双色球的规则，双色球由红色球和蓝色球组成，每注投注号码由6个红色球号码和1个蓝色球号码组成。

红色球号码从1--33中选择；蓝色球号码从1--16中选择。同时，一柱号码中，蓝色球不能出现在红色球里。

规则讲完了，我们来看实现，直接上代码，代码里有注释，应该都能看懂

/*生成1-33个号码的球*/
WITH    x0
          AS ( SELECT   number AS ball
               FROM     master.dbo.spt_values
               WHERE    type = 'P'
                        AND number <= 33
                        AND number >= 1
             ),/*随机生成6个红色球*/
        x1
          AS ( SELECT TOP 6
                        ball
               FROM     x0
               ORDER BY NEWID()
             )
    SELECT  redball AS 红色球 ,
            ( /*生成蓝色球*/ SELECT TOP 1
                                ball
                        FROM    x0
                        WHERE   ball <= 16
                                AND ball NOT IN ( SELECT    ball
                                                  FROM      x1 )
                        ORDER BY NEWID()
            ) AS 蓝色球
    FROM    ( /*将红色球排到一行*/ SELECT   REPLACE(( SELECT    CAST(ball AS VARCHAR)
                                                        + ','
                                              FROM      x1
                                            FOR
                                              XML PATH('')
                                            ), ',', ' ') AS redball
            ) t

这样就实现了吗？？？

没有！！！

这里挖了一个坑，我们先看下意外的结果

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蓝色球和红色球出现重号

问题就出现在我用cte生成随机的6个红色球，每次调用x1的时候，这6个数都会随机生成，所以，才会出现这样的结果。

问题已经查明了，我们把6个红色球存到临时表里头，就不会每次调用的时候会发生改变。

更改后的SQL如下：

/*生成1-33号码的球*/
SELECT  number AS ball
INTO    #t0
FROM    master.dbo.spt_values
WHERE   type = 'P'
        AND number <= 33
        AND number >= 1
/*生成6个红色球*/
SELECT TOP 6
        ball
INTO    #t1
FROM    #t0
ORDER BY NEWID()

SELECT  redball AS 红色球 ,
        ( /*生成蓝色球*/ SELECT TOP 1
                            ball
                    FROM    #t0
                    WHERE   ball <= 16
                            AND ball NOT IN ( SELECT    ball
                                              FROM      #t1 )
                    ORDER BY NEWID()
        ) AS 蓝色球
FROM    ( /*将红色球排到一行*/ SELECT   REPLACE(( SELECT    CAST(ball AS VARCHAR)
                                                    + ','
                                          FROM      #t1
                                        FOR
                                          XML PATH('')
                                        ), ',', ' ') AS redball
        ) t

经网友Yuanet在评论中提醒，双色球的规则，蓝色球是可以出现在红色球中的。

因此，我对原来的代码做一些改动，使计算结果符合双色球的规则。

/*生成1-33个号码的球*/
WITH    x0
          AS ( SELECT   number AS ball
               FROM     master.dbo.spt_values
               WHERE    type = 'P'
                        AND number <= 33
                        AND number >= 1
             ),/*随机生成6个红色球*/
        x1
          AS ( SELECT TOP 6
                        ball
               FROM     x0
               ORDER BY NEWID()
             )
    SELECT  redball AS 红色球 ,
            CAST(RAND()*16+1 AS INT) AS 蓝色球
    FROM    ( /*将红色球排到一行*/ SELECT   REPLACE(( SELECT    CAST(ball AS VARCHAR)
                                                        + ','
                                              FROM      x1
                                            FOR
                                              XML PATH('')
                                            ), ',', ' ') AS redball
            ) t