Question

我尝试构建一个查询，显示每个月/每年的用户总数。我现在的查询向我显示了在任何特定月/年点创建的用户。但我想要的是用户的总和，直到那一点，而不仅仅是在那段时间内创建的用户。这是表结构：

mysql> desc users;
+-------------------+------------------+------+-----+---------+----------------+
| Field             | Type             | Null | Key | Default | Extra          |
+-------------------+------------------+------+-----+---------+----------------+
| id                | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| username          | int(11)          | NO   |     | NULL    |                |
| password          | varchar(255)     | NO   |     | NULL    |                |
| email             | varchar(255)     | NO   |     | NULL    |                |
| legajo            | int(10) unsigned | NO   |     | NULL    |                |
| doc_tipo          | varchar(45)      | NO   |     | NULL    |                |
| doc_nro           | int(10) unsigned | NO   |     | NULL    |                |
| activo            | int(10) unsigned | NO   |     | 0       |                |
| token_actv        | varchar(255)     | NO   |     | NULL    |                |
| token_fecha_envio | datetime         | NO   |     | NULL    |                |
| created           | datetime         | YES  |     | NULL    |                |
| modified          | datetime         | YES  |     | NULL    |                |
| role              | varchar(60)      | NO   |     | usuario |                |
| nombres           | varchar(255)     | YES  |     | NULL    |                |
| apellido          | varchar(255)     | YES  |     | NULL    |                |
+-------------------+------------------+------+-----+---------+----------------+

这是查询。

SELECT CONCAT_WS('/',Month(created),YEAR(created)), Count(*)
FROM users
GROUP BY Month(created),YEAR(created)
ORDER BY Month(created) ASC ,YEAR(created) ASC

当前查询的结果如下：

mysql> SELECT CONCAT_WS('/',Month(created),YEAR(created)), Count(*) FROM users GROUP BY Month(created),YEAR(created) ORDER BY Month(created) ASC ,YEAR(created) ASC LIMIT 5;
+---------------------------------------------+----------+
| CONCAT_WS('/',Month(created),YEAR(created)) | Count(*) |
+---------------------------------------------+----------+
| 1/2010                                      |       79 |
| 1/2011                                      |       70 |
| 1/2012                                      |       70 |
| 1/2013                                      |       80 |
| 1/2014                                      |       64 |
+---------------------------------------------+----------+

非常感谢任何帮助。

Answer 1

您需要做的就是使用您拥有的查询作为另一个查询的输入，然后使用mysql变量来保存累积总和 - 假设您将年/月字符串别名为d，并计算您的计数值如c：

select d , @sum := @sum + c as rolling_total from (
  SELECT CONCAT_WS('/',Month(created),YEAR(created)) d, Count(*) c
    FROM users
    GROUP BY Month(created),YEAR(created)
    ORDER BY Month(created) ASC ,YEAR(created) ASC
  ) q cross join (select @sum := 0) qq

demo here

MySQL每次的行数

1 个答案: