内部联接两个表的汇总列值

Question

假设我有两个表：[ReceivingLog]和[Customer_Event]。请参阅下表。

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     logId    eventId    customerId    pmCount    pmWeight
       1       1411       4196            1         14
       2       1411       4196            2         14
       3       1411       4198            1         14
       4       1411       4198            1         11
       5       1411       4196            3         10

Customer_Event

     customerId    eventId
       4196         1411 
       4198         1411
       4199         1411

我想得到这种结果

     customerId    pmCount    pmWeight
       4196           6          38 
       4198           2          25 
       4199           0           0 

我在下面尝试了此查询，但是我得到了重复的行

SELECT [Log].customerId, [Log].pmCount, [Log].pmWeight
FROM [Log] INNER JOIN [Customer_Event] ON [Log].eventId = [Customer_Event].eventId
WHERE [Log].eventId = 1411

我应该使用哪个查询来获得预期的结果？

Answer 1

尝试一下，我输入了一些示例数据并进行了尝试，效果很好：

#!/usr/bin/env python
# -*- coding: utf-8 -*- 

Answer 2

我认为这会有效，未经测试。

change

Answer 3

尝试一下

Select c.CustomerID, ISNULL(sum(l.pmCount),0), ISNULL(sum(l.pmWeight),0)
from #Customer_Event c
    left join #ReceivingLog l on c.eventId = l.eventID and c.customerId = l.customerId
group by c.CustomerID