怎么按投票数来排序?
表tp
toupiao_id name ........
1 张三
2 李四
表tp1
id toupiao_id ip
1 1 .......
1 1 .......
1 2 .......
1 2 .......
1 2 .......
循环表tp
$sql = "SELECT * FROM ".$fdyu->table('tp')." ".$sql_where." order by toupiao_id asc";//// 请问order by这个怎么写可以按表tp1里的toupiao_id数的多少来排列
$res = $db->query($sql);
$arr = array();
比如,李四有3票,张三有2票,那么在循环tp表的时候,李四显示在前面,张三显示在后面
回复讨论(解决方案)
最近天气一冷一热的
你这种情况我一般会把数量缓存到表1中,每次投票更新一下
现在已经没放了,有什么办法解决
对 toupiao_id 分组求 count
帮忙写一下,谢谢^_^
可以这样写:
select tp1.toupiao_id, count(*) as total_vote from tp1 left join tp on tp1.toupiao_id = tp.toupiao_id group by tp1.toupiao_id order by total_vote desc;
select a.*,b.num from tp as a left join (select toupiao_id,count(*) as num from tp1 group by toupiao_id) as b on a.toupiao_id=b.toupiao_id order by b.num desc;
后来发现这样统计和排序票数,数据库到后面票数多的时候受不了,后来还是改成1楼说的那样了

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