MySQL 每次行数

Question

我正在尝试构建一个查询来显示每个 month/year 的用户总数。我现在的查询显示了在任何特定 month/year 点创建的用户。但我想要的是到那时为止的用户总和，而不仅仅是那段时间创建的用户。这是 table 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 |
+---------------------------------------------+----------+

任何帮助将不胜感激。

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 变量来保存累计和 - 假设您为 year/month 设置了别名字符串为 d，您的计数值为 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

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