php查询mysql并统计同一字段的数量，最后按这个数量降序排序

$sx=$empire->fetch1("select uid,username,id from biao order by userid desc limit 1000");
$totalnum=$empire->gettotal("select count(*) as total from biao where userid='$sx[userid]'");
select uid,username from biao2 where uid='$sx[userid]' order by '$totalnum' desc limit 5

差不多以上意思，想统计表中UID一样数据，比如
username   uid      表中一样uid数目

张三           1          7个
李四          2            4个
啊们           3           5个
最后排序实现
张三7个
啊们5个
李四4个

select  username,count(uid) as num from biao group by username  order by num (desc|asc)

来自  https://blog.csdn.net/a9925/article/details/46833733