MySQL查询顺序的行数是多少？

Question

我有一个用于投票的mysql表。有id，project_id和vote字段（如果投票选择了特定项目，则为1）。现在我想根据这些条目生成排名。有没有办法获得每个project_id的投票数，并通过单个mysql查询自动按项目的TRUE投票数排序？或者你知道php方式吗？

e.g。

ID | Project ID | Vote
-----------------------
1  | 2          | 1
2  | 2          | 1
3  | 1          | 1

==＆GT;

项目编号2有2个投票

项目编号1有1个投票

提前致谢！

Answer 1

SELECT 
   `project_id`, SUM(`vote`) AS vote_count 
FROM 
   `table_name` 
GROUP BY `project_id`
ORDER BY vote_count DESC

如果你以关联数组的形式获取，

对SUM进行别名将帮助你在php中找到该列

Answer 2

Select project_id, Sum( vote ) project_vote
From votes
Group By project_id
Order By project_vote Desc

GROUP BY允许您获得每个project_id的投票总和，ORDER BY DESC将最高票数放在首位。

Answer 3

使用GROUP BY：

SELECT project_id, SUM(vote) as votes 
FROM table 
GROUP BY project_id 
ORDER BY votes DESC

Answer 4

试试这个：

SELECT 
    ProjectID,SUM(Vote) 
    FROM YourTable 
    GROUP BY ProjectID 
    ORDER BY Sum(Vote) DESC