MySQL帮助连接表以创建

Question

让我首先说我不是sql专家或jasper-reports专家，但我正在尝试生成一个报告，显示每月按公司和客户登录我的项目的人。我还知道，我正在设计这个查询，以便在未来的一个月中看到数据，这样我就可以处理一家公司注册创建一个或2个客户端，然后不登录或做任何事情的可能性。

这就是我希望返回的数据看起来是什么样子：

 Date       Company    Client    Client_ID     Authentications    Unique_Users
 2016-may   Company-A  client-1        1             24                 1
 2016-may   Company-A  client-2        2             10                 2
 2016-may   Company-A  client-3        3             0                  0
 2016-June   Company-A  client-1       1             0                  0
 2016-June   Company-A  client-2       2             0                  0
 2016-June   Company-A  client-3       3             0                  0

我有一个查询，它将返回发生操作的日期、公司名称、客户名称、客户id、作者和唯一用户。此查询省略了没有身份验证的行。

SELECT
     DATE_FORMAT(rq.requestTime, '%Y-%M') AS Date,
     company.name AS Company,
     client.name AS Client,
     client.id AS client_id,
     COUNT(rq.id) AS Authentications,
     COUNT(DISTINCT rq.personguid) AS Unique_Users         
FROM
company JOIN CLIENT ON company.id = client.company_id  
    LEFT JOIN request_queue rq ON rq.clientid = client.id
WHERE
 company.id = 19
 AND rq.status = 'complete' AND rq.request_type LIKE "%authorize%" 
     AND MONTH(rq.requestTime) >= MONTH("2016-05-01") 
     AND MONTH(rq.requestTime) <= MONTH("2016-06-01")
GROUP BY
     client_id, Date
ORDER BY Date ASC, client_id ASC;

这将返回类似的内容，因为有些客户端在5月和6月还没有登录记录，基本上没有request_queue数据--没有行：

 Date       Company    Client    Client_ID     Authentications    Unique_Users
 2016-may   Company-A  client-1        1             24                 1
 2016-may   Company-A  client-2        2             10                 2

在这一点上，我想到了这个。

SELECT
dateTable.mydate AS Date,
clientTable.ClientName AS Client,
clientTable.CompanyName AS Company,
clientTable.client_id AS Client_ID
FROM
(SELECT 
client.name AS ClientName, 
client.id AS client_id,
company.name AS CompanyName 
FROM 
company JOIN CLIENT ON company.id = client.company_id 
WHERE company.id = 19) clientTable
JOIN
(SELECT 
DATE_FORMAT(temp.thedate,'%Y-%M') AS mydate, 
temp.thedate AS theDate FROM (
        SELECT 
    DATE_ADD("2016-05-01", INTERVAL u.i MONTH) AS thedate
        FROM i AS u ORDER BY thedate) temp
        WHERE temp.thedate <= "2016-06-01") dateTable;

这为我提供了一个没有request_queue数据的表，该表有日期、公司名称、客户名称和客户ids。

这张桌子看起来是这样的：

Date       Company    Client    Client_ID
2016-may   Company-A  client-1        1
2016-may   Company-A  client-2        2
2016-may   Company-A  client-3        3
2016-June   Company-A  client-1       1
2016-June   Company-A  client-2       2
2016-June   Company-A  client-3       3

有没有办法组合这些数据，使图表位于这篇文章的顶部？

附加信息:目标是将我的查询结果传递给jasper报表设计器ireport。我使用这些数据创建了一个交叉表，上面有日期，左边是客户端，然后将身份验证放在交叉行中。

我从大学开始就没接触过sql了。如有任何想法或指导，将不胜感激。

Answer 1

从您的上一个查询开始，我一直在按自己的方式工作，这似乎产生了您需要的东西：

SELECT
    dateTable.mydate AS Date,
    clientTable.ClientName AS Client,
    clientTable.CompanyName AS Company,
    clientTable.client_id AS Client_ID,
    COUNT(rq.id) AS Authentications,
    COUNT(DISTINCT rq.personguid) AS Unique_Users  
FROM
(SELECT 
    client.name AS ClientName, 
    client.id AS client_id,
    company.name AS CompanyName 
    FROM company JOIN CLIENT ON company.id = client.company_id 
    WHERE company.id = 19) clientTable
JOIN (SELECT 
    DATE_FORMAT(temp.thedate,'%Y-%M') AS mydate, 
    temp.thedate AS theDate
    FROM (SELECT
            DATE_ADD("2016-05-01", INTERVAL u.i MONTH) AS thedate
            FROM i AS u ORDER BY thedate) temp
            WHERE temp.thedate <= "2016-06-01") dateTable
LEFT JOIN request_queue rq on (rq.clientid = clientTable.client_ID and DATE_FORMAT(rq.requestTime,'%Y-%M') = dateTable.mydate)
GROUP BY Client_ID, Date
ORDER BY Date ASC, Client_ID ASC;

当然，这是不考虑请求类型和状态的简化版本，但我认为您可以轻松地从这里开始工作。