Question

所以我有一个MySQL数据库

CREATE TABLE `all_time_earners` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `image` varchar(250) NOT NULL,
  `username` varchar(250) NOT NULL,
  `earnings` int(11) NOT NULL,
  `rank` int(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8

这就是我的桌子的样子

id     username      earnings  rank
====================================================
1,          ken,       100,      0
2,          dave,       50,      0
3,          bob,       300,      0
4,          ken,       150,      0
5,          ken,       200,      0

我正在尝试使用GROUP BY用户名，但不会为使用的用户显示多个条目

"SELECT * FROM all_time_earners GROUP BY username ORDER BY earnings DESC;"

问题在于它不能汇总收益

请问有人对我做错了吗？
如何对这些用户进行排名，例如：收入最高的用户排名1，其次是排名2，等等

Answer 1

我相信使用Mysql 5.7可以实现所需的目标：

SELECT username, 
       SUM(earnings) AS totalEarnings
FROM all_time_earners ate
GROUP BY username
ORDER BY totalEarnings DESC;

如果要添加等级号：

SET @row_number = 0;

SELECT te.*, 
       @row_number := @row_number + 1 AS rank
FROM (
  SELECT username, 
         SUM(earnings) AS totalEarnings
  FROM all_time_earners ate
  GROUP BY username
  ORDER BY totalEarnings DESC
) te

在此DB Fiddle

中查看

如何将所有分数按用户名分组在表格中并显示排名？

1 个答案: