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SQL Distinct Grouping?
原标题:
  • 时间:2009-11-13 18:59:44
  •  标签:
  • sql
  • group-by

Here is my query:

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

Here is what my results look like:

    emailOpened emailUnsubscribed emailBounced Totals

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

I would like the total for email opend to be 8 and not 6. I realize i am asking SQL to group them that way. I just want to know how I can get Distict totals for each column. So, emailOpened would be 8, emailUnsubscribed would be 1, and emailBounced would be 2. Thanks

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

EDIT: If you are looking to count records when the flag is true, you could write it as below

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: In above query, replace true with the bit value that is interpreted as true (it could be 0).

问题回答

I would assume you only want to count the records where the values are set to true. If so then this might work:

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




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