mysql - MySQL查询加权投票 - 如何计算分配给不同列的值

Question

我有一个将值写入 mysql 数据库表的投票应用程序。这是一个偏好/加权投票系统，因此人们选择第一个选项、第二个选项和第三个选项。这些都进入表中的单独字段。我正在寻找一种编写查询的方法，该查询将为响应分配数值（第一个响应为 3，第二个响应为 2，第一个响应为 1），然后显示带有总分的值。我已经能够为总票数做到这一点

select count(name) as votes,name 
from (select 1st_option as name from votes 
      union all 
      select 2nd_option from votes 
      union all 
      select 3rd_option from votes) as tbl 
group by name 
having count(name) > 0 
order by 1 desc;

但还没有完全弄清楚如何为每一列中的响应分配值，然后将它们拉到一起。任何帮助深表感谢。谢谢！

Answer 1

你可以这样做：

select sum(score) as votes,name 
from (select 1st_option as name, 3 as score from votes 
      union all 
      select 2nd_option as name, 2 as score from votes 
      union all 
      select 3rd_option as name, 1 as score from votes) as tbl 
group by name;