使用临时表查询数据的一个例子

$sql3="CREATE TEMPORARY TABLE atmp_table(uid int(11),dnum int(20) not null)"; 
mysql_query($sql3); 
$sql3="INSERT into atmp_table(uid,dnum) SELECT uid,count(soid) as dnum 
        FROM `cy_score2` 
        where (nei='下载' or nei='下载试题')   
        group by uid having dnum>150 
        order by dnum desc limit 10"; 
mysql_query($sql3); 
$sql3="select a.uid,count(b.tid) as unum from atmp_table a left join cy_test b on a.uid=b.uid 
        group by b.uid 
        order by a.dnum desc,unum asc limit 5"; 
$query4=mysql_query($sql3); 
$rs=mysql_fetch_array($query4) ;