使用给定变量显示最近的行

Question

下面的代码从MySQL表中查询“timestamp”类型字段，称为“time”。

  $contest = "SELECT SUM(points) AS total, COUNT(points) AS total2, loginid, comment
               FROM contest 
              WHERE loginid = '$idn'";

编辑：我想对所有行的点数求和。但是，我想显示最近时间戳的注释。我如何在1个查询中执行此操作？

Answer 1

SELECT points, comment, timestamp
FROM contest
WHERE loginid = '$idn'
ORDER BY timestamp DESC
LIMIT 1

Answer 2

根据您编辑的帖子：

$contest = "SELECT SUM(points) AS total, COUNT(points) AS total2
            FROM contest 
            WHERE loginid = '$idn'
            GROUP BY time DESC  
            LIMIT 1";