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Home Backend Development PHP Tutorial 怎么按投票数来排序?

怎么按投票数来排序?

Jun 20, 2016 pm 12:28 PM

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;
Copy after login

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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