php中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) ;