mysqlsum()函数怎么得不到正确的结果啊！！！！

问题是这样的：一个充值表state=1表示充值成功的，一个消费表state=1表示消费成功的。我要列出充值成功的总值大于消费成功的总值所以用户id，充值总值，消费总值。语句如下： SELECT a.userid,SUM(a.number) AS mai,SUM(i.total) AS hua FROM account AS a,info AS i WHERE a.state=1 AND a.userid=i.userid AND i.state=1 GROUP BY a.userid HAVING SUM(a.number)>SUM(i.total) 但是充值总值，消费总值错误了。。。 比如充值4次成功。消费3次成功。 列出的充值额是真值*3次。消费额是真值*4次啊！！！！这不是我要的结果啊！！ 求正确的语句！！！！！！ SELECT a.userid, a.mai, i.hua FROM (SELECT userid, SUM(number) AS mai FROM account WHERE state=1 GROUP BY userid) AS a, (SELECT userid, SUM(total) AS hua FROM info WHERE state=1 GROUP BY userid) AS i WHERE a.userid=i.userid AND a.mai > i.hua

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