大部分网上提供的dedecmsCMS下载排行都只能针对一个软件只有一个下载地址的情况，
如果一个软件里有多个下载地址就不行了，以下sql语句可以解决这个问题：
select a.id as aid,a.title,a.shorttitle,a.litpic,d.id as did,sum(d.downloads) as downloads from dede_archives as a,dede_downloads as d where a.id = d.id and a.arcrank=0 group by d.id order by downloads desc limit 10
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