Question

我有支持票据数据库，它们分为两个表，比如Incidents，Tasks。
Incidents包含字段assigned_group，open_time，close_time
Tasks包含字段assignment，issue_date，close_date（含义相同但名称不同）

现在我需要的是在特定时间段内编译以下结构的报告：

Group | Total opened incidents + tasks | Total closed incidents + tasks)

单个查询将如下所示：

-- Q1: Total opened incidents
SELECT assigned_group, COUNT(*) FROM incidents WHERE open_time BETWEEN '2014-01-01 00:00:00' AND '2014-02-01 00:00:00' GROUP BY assigned_group

-- Q2: Total closed incidents
SELECT assigned_group, COUNT(*) FROM incidents WHERE close_time BETWEEN '2014-01-01 00:00:00' AND '2014-02-01 00:00:00' GROUP BY assigned_group

-- Q3: Total opened tasks
SELECT assignment, COUNT(*) FROM tasks WHERE issue_date BETWEEN '2014-01-01 00:00:00' AND '2014-02-01 00:00:00' GROUP BY assignment

-- Q4: Total closed tasks
SELECT assignment, COUNT(*) FROM tasks WHERE close_date BETWEEN '2014-01-01 00:00:00' AND '2014-02-01 00:00:00' GROUP BY assignment

结果表应为

Group | Q1+Q3 | Q2+Q4

请注意，在每个查询中，行数（组）数可能不同，例如在特定时期没有打开任务，但有些任务已经关闭，这仍应计算在内

谢谢！

Answer 1

我是否正确地想要获得加入Q1和Q3所需的已开启事件和任务的总数（假设assigned_group和assignment对加入有效）？如果是，则以下子选项将返回打开事件的总数

SELECT Incidents.IncidentCount + Tasks.TaskCount AS TotalOpenIncidents ,
       COALESCE(Incidents.assigned_group, Tasks.assignment) AS Group
FROM (
    SELECT assigned_group, COUNT(*) AS IncidentCount 
    FROM incidents 
    WHERE open_time BETWEEN '2014-01-01 00:00:00' AND '2014-02-01 00:00:00' 
    GROUP BY assigned_group ) AS Incidents INNER JOIN
    (
    SELECT assignment, COUNT(*) AS TaskCount
    FROM tasks 
    WHERE issue_date BETWEEN '2014-01-01 00:00:00' AND '2014-02-01 00:00:00' 
    GROUP BY assignment) AS Tasks ON Incidents.assigned_group = Tasks.assignment

您需要对Q2和Q4执行相同操作以获得已关闭的计数

Answer 2

要将这类数据粘贴在一起，您可以使用“完全外部连接”。或UNION ALL。这是UNION ALL方法：

有一些方法可以将此查询重构为更简单。如果您有兴趣，我可以向您展示，或者您可以自己尝试。例如，在Z子表中只需要2个查询。

如果您的连接列不是唯一的，UNION ALL方法会停止重复计算（尽管在您的情况下这不是问题）

SELECT assigned_group, SUM(Closed) As Closed, SUM(Opened) As Opened
FROM
(
SELECT assigned_group, COUNT(*) As Closed, 0 As Opened
FROM incidents 
WHERE open_time BETWEEN '2014-01-01     00:00:00' AND '2014-02-01 00:00:00' 
GROUP BY assigned_group

UNION ALL

SELECT assigned_group, 0 As Closed, COUNT(*) As Opened
FROM incidents 
WHERE close_time BETWEEN '2014-01-01 00:00:00' AND '2014-02-01 00:00:00' 
GROUP BY assigned_group

UNION ALL

SELECT assignment, 0 As Closed, COUNT(*) As Opened
FROM tasks 
WHERE issue_date BETWEEN '2014-01-01 00:00:00' AND '2014-02-01 00:00:00' 
GROUP BY assignment

UNION ALL

SELECT assignment, COUNT(*) As Closed, 0 As Opened
FROM tasks 
WHERE close_date BETWEEN '2014-01-01 00:00:00' AND '2014-02-01 00:00:00' 
GROUP BY assignment
) Z
GROUP BY assigned_group,

SQL查询组合来自不同表的报告

2 个答案: