SQL 两个表之间的计数

Question

我目前在 SQL 服务器中有两个单独的查询，计算 table 在一周内包含唯一 ID 的次数。我想使用一个查询来显示这些，而不是两个。

此数据保存在两个单独的视图中，因此我编写了两个查询。这些是 ActivityPointer 和 Asp_dealercallreport。

查询 #1：

SELECT 
    OwnerIDName, 
    COUNT(Distinct ActivityID) AS CalendarEvents
FROM 
    ActivityPointer
WHERE
    /*Specify Activity code for Calendar Events*/
    ActivityTypeCode = '4201'
    /*Specify Calendar Events from this week only*/
    AND ScheduledStart >= DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()) / 7 * 7, 0)
    AND ScheduledStart <= DATEADD(DAY, DATEDIFF(DAY, -1, GETDATE()), 0)
    /*Specify users to be reported on by Name*/
    AND OwnerIdName IN ('John Doe', 'Jane Doe')
GROUP BY 
    OwnerIDName

查询#2：

SELECT 
    OwnerIDName, 
    COUNT(Distinct Asp_dealercallreportId) AS DealerVisits
FROM 
    Asp_dealercallreport
    /*Specify Calendar Events from this week only*/
WHERE    
    asp_callreportdate >= DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()) / 7 * 7, 0)
    AND asp_callreportdate <= DATEADD(DAY, DATEDIFF(DAY, -1, GETDATE()), 0)
    /*Specify  to be reported on by Name*/
    AND OwnerIdName IN ('John Doe', 'Jane Doe')
GROUP BY 
    OwnerIDName

谢谢

Answer 1

使用条件聚合：

SELECT OwnerIDName,
       COUNT(Distinct case when ScheduledStart >= DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()) / 7 * 7, 0) AND
                                ScheduledStart <= DATEADD(DAY, DATEDIFF(DAY, -1, GETDATE()), 0)
                           then ActivityID end) AS CalendarEvents_Scheduled,
       COUNT(Distinct case when asp_callreportdate >= DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()) / 7 * 7, 0) and
                                asp_callreportdate <= DATEADD(DAY, DATEDIFF(DAY, -1, GETDATE()), 0)
                           then ActivityID end) AS CalendarEvents_asp
FROM ActivityPointer
WHERE ActivityTypeCode = '4201' AND
      OwnerIdName IN ('John Doe', 'Jane Doe')
GROUP BY OwnerIDName;

Answer 2

也许您可以简单地使用 INNER JOIN 运算符？像这样：

SELECT 
    ap.OwnerIDName, 
    COUNT(Distinct ap.ActivityID) AS CalendarEvents, 
    COUNT(Distinct a_dcr.Asp_dealercallreportId) AS DealerVisits
FROM 
    ActivityPointer ap
INNER JOIN 
    Asp_dealercallreport a_dcr ON ap.OwnerIDName=a_dcr.OwnerIDName
WHERE
/*Specify Activity code for Calendar Events*/
    ap.ActivityTypeCode = '4201'
/*Specify Calendar Events from this week only*/
    AND ap.ScheduledStart >= DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()) / 7 * 7, 0)
    AND ap.ScheduledStart <= DATEADD(DAY, DATEDIFF(DAY, -1, GETDATE()), 0)
/*Specify Calendar Events from this week only*/
    AND a_dcr.asp_callreportdate >= DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()) / 7 * 7, 0)
    AND a_dcr.asp_callreportdate <= DATEADD(DAY, DATEDIFF(DAY, -1, GETDATE()), 0)
/*Specify users to be reported on by Name*/
    AND ap.OwnerIdName IN ('John Doe', 'Jane Doe')
GROUP BY 
    ap.OwnerIDName

Answer 3

使用标准 SQL UNION 将在一个结果集中为您提供两个查询的输出。只要它们具有相同的列数和类型：

http://www.w3schools.com/sql/sql_union.asp

SELECT OwnerIDName, COUNT(Distinct ActivityID) AS CalendarEvents
FROM ActivityPointer
WHERE
/*Specify Activity code for Calendar Events*/
    ActivityTypeCode = '4201'
/*Specify Calendar Events from this week only*/
AND ScheduledStart >= DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()) / 7 * 7, 0)
AND ScheduledStart <= DATEADD(DAY, DATEDIFF(DAY, -1, GETDATE()), 0)
/*Specify users to be reported on by Name*/
AND OwnerIdName IN ('John Doe', 'Jane Doe')
GROUP BY OwnerIDName    
UNION
SELECT OwnerIDName, COUNT(Distinct Asp_dealercallreportId) AS DealerVisits
FROM Asp_dealercallreport
/*Specify Calendar Events from this week only*/
WHERE    asp_callreportdate >= DATEADD(DAY, DATEDIFF(DAY, 0, GETDATE()) / 7  * 7, 0)
AND    asp_callreportdate <= DATEADD(DAY, DATEDIFF(DAY, -1, GETDATE()), 0)
/*Specify  to be reported on by Name*/
AND    OwnerIdName IN ('John Doe', 'Jane Doe')
GROUP BY OwnerIDName

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