Question

我在MySql数据库中有这3个表。

users
+----+------+--------+------+
| Id | Name | Status | Role |
+----+------+--------+------+
|  1 | A    | Aktiv  | Op   |
|  2 | B    | Aktiv  | Op   |
|  3 | C    | Aktiv  | Op   |
|  4 | D    | Aktiv  | Op   |
+----+------+--------+------+

cnt
+----+------+------------+------+
| Id | Name | Date       | Type |
+----+------+------------+------+
|  1 | A    | 2017-11-09 | Web  |
|  2 | B    | 2017-11-09 | Web  |
|  3 | C    | 2017-11-09 | Web  |
|  4 | C    | 2017-11-09 | Inb  |
|  5 | A    | 2017-11-09 | Web  |
+----+------+------------+------+

Lead
+----+------+------------------+------------+
| Id | Name | Date             | Type       |
+----+------+------------------+------------+
|  1 | A    | 2017-11-09 00:24 | Imported   |
|  2 | B    | 2017-11-09 09:32 | Activation |
|  3 | B    | 2017-11-09 10:56 | Activation |
|  4 | D    | 2017-11-09 12:21 | Activation |
|  5 | D    | 2017-11-10 12:22 | Activation |
+----+------+------------------+------------+

我正在尝试将它们加入主表但没有成功，我正在使用的查询是：

SELECT IFNULL(u.Name,'Total') as "Name",
Sum(IF(c.Type = 'Web',1,0)) as "Cnt Web",
Sum(IF(l.Type = 'Activation',1,0)) as "Lead Web"
FROM users u
LEFT JOIN cnt c ON u.Name = c.Name and c.Date = '2017-11-09'
LEFT JOIN lead l ON u.Name = l.Name and l.Date>= '2017-11-09' AND l.Date< '2017-11-10'
WHERE u.Status = 'Aktiv' AND u.Role = 'Op'
GROUP BY u.Name WITH ROLLUP

我需要的结果是这样一个表：

+----+------+--------+---------+
| Id | Name | Cnt Web| Lead Web|
+----+------+------------------+
|  1 | A    | 2      | 0       |
|  2 | B    | 1      | 2       |
|  3 | C    | 1      | 0       | 
|  4 | D    | 0      | 1       |   
+----+------+------------------+

当我尝试将第一个表与第二个表或第一个表连接到第三个表时，我得到了正确的结果，但是当我加入它们时，我无法获得所需的结果。

任何答案都是最受欢迎的。先感谢您。

Answer 1

这是使用相关子查询的解决方案

SELECT  u.Id,
        u.Name,
        (SELECT COUNT(Name) FROM cnt WHERE Name = u.name AND type = 'Web' AND Date = '2017-11-09') AS cnt_web,
        (SELECT COUNT(Name) FROM lead WHERE Name = u.name AND type = 'Activation' AND Date>= '2017-11-09' AND Date< '2017-11-10') AS cnt_lead
FROM    users u
WHERE   u.Status = 'Aktiv' AND u.Role = 'Op'

在MySql查询中加入3个表

1 个答案: