Question

这是我的问题：

SELECT 
  dbo.EmailCampaignTracking.emailOpened,
  dbo.EmailCampaignTracking.emailUnsubscribed,
  dbo.EmailCampaignTracking.emailBounced,
  COUNT(*)
FROM
  dbo.EmailCampaignTracking
  Group By
  dbo.EmailCampaignTracking.emailBounced,
  dbo.EmailCampaignTracking.emailUnsubscribed,
  dbo.EmailCampaignTracking.emailOpened

以下是我的结果：

    emailOpened emailUnsubscribed emailBounced Totals

    True          False            False          6      
    False         False            True           1   
    True          True             False          2

我希望电子邮件opend的总数为8而不是6.我意识到我要求SQL将它们分组。我只是想知道如何为每一列获得Distict总数。因此，emailOpened为8，emailUnsubscribed将为1，emailBounced为2.谢谢

Answer 1

SELECT Count(emailOpened) AS OpenedCount,
Count(emailUnsubscribed) as UnsubCount,
Count(emailBounced) as BouncedCount
FROM dbo.EmailCampaignTracking

编辑：如果您希望在标志为真时计算记录，可以按以下方式编写

SELECT SUM(CASE emailOpened WHEN true then 1 else 0) AS OpenedCount,
SUM(CASE emailUnsubscribed WHEN true then 1 else 0) as UnsubCount,
SUM(CASE emailBounced WHEN true then 1 else 0) as BouncedCount
FROM dbo.EmailCampaignTracking

EDIT2：在上面的查询中，将true替换为被解释为true的位值（可能为0）。

Answer 2

我认为你只想计算值设置为true的记录。如果是这样，那么这可能会起作用：

SELECT SUM(CAST(EmailOpened AS INT)) AS OpenedEmails,
  SUM(CAST(EmailUnsubscribed AS INT)) AS UnsubscribedEmails,
  SUM(CAST(EmailBounced AS INT)) AS EmailBounced
FROM dbo.EmailCampainTracking

SQL独特的分组？

2 个答案: