在 INNER JOIN SQL 服务器上获取 DISTINCT 记录

Question

我有两个 table。我有通过 INNER JOIN 子句将第一个 table 连接到第二个 table 的查询。结果表明存在冗余或重复的结果。在我下面的示例中，结果有 4 条记录。我想区分 SdiID，我希望只得到两条记录，因为 sdiID 只有两条唯一记录。我尝试在 select 之后添加 DISTINCT sdiID 但我仍然得到 4 条记录。请帮忙。这是我的查询。

    DECLARE @PageNumber AS INT, @RowspPage AS INT 
        SET @PageNumber = 1 
        SET @RowspPage = 20 
        SELECT totalCount = COUNT(*) OVER(), mailbox.ID as mailboxID, 
          sdi.ID as sdiID
           FROM [SDI].dbo.UserDocumentLocationOutbox mailbox 
           INNER JOIN [SDI].dbo.SDITransaction
           sdi on mailbox.SDITransactionID=sdi.ID 
         INNER JOIN [SYSDB].dbo.DocumentType doc on sdi.DocumentTypeID=doc.ID 
    where mailbox.CommunityID = '9ff10c7a-37f5-4580-9163-6ada55194ca7' 
    and mailbox.UserProfileID = 'f9791614-8cc0-42e3-87d1-53709bc1e099' 
    and doc.CommunityID = '9ff10c7a-37f5-4580-9163-6ada55194ca7' 
    and doc.Active=1 and doc.HideInMailbox=0  
    order by sdi.ProcessedDateTime desc 
OFFSET ((@PageNumber - 1) * @RowspPage) ROWS FETCH NEXT @RowspPage ROWS ONLY

这是结果

Answer 1

由于您有 4 个不同的 mailboxID 值，因此此查询总是会得到 4 个结果。即您的每个 sdiID 都有两个关联的 MailboxID，因此它们是不同的记录。您可以通过选择 MAX(mailbox.id) 作为 mailboxID 或 MIN(Mailbox.id) 作为 mailboxID 并按 ID 分组来为每个 ID 删除其中一个 ID？

Answer 2

  with cte as (SELECT ROW_NUMBER() over(PARTITION BY sdi.ID order by sdi.ID) as rn,totalCount = COUNT(*) OVER(), mailbox.ID as mailboxID, 
          sdi.ID as sdiID
           FROM [SDI].dbo.UserDocumentLocationOutbox mailbox 
           INNER JOIN [SDI].dbo.SDITransaction
           sdi on mailbox.SDITransactionID=sdi.ID 
         INNER JOIN [SYSDB].dbo.DocumentType doc on sdi.DocumentTypeID=doc.ID 
    where mailbox.CommunityID = '9ff10c7a-37f5-4580-9163-6ada55194ca7' 
    and mailbox.UserProfileID = 'f9791614-8cc0-42e3-87d1-53709bc1e099' 
    and doc.CommunityID = '9ff10c7a-37f5-4580-9163-6ada55194ca7' 
    and doc.Active=1 and doc.HideInMailbox=0  
    order by sdi.ProcessedDateTime desc 
OFFSET ((@PageNumber - 1) * @RowspPage) ROWS FETCH NEXT @RowspPage ROWS ONLY)
select totalCount, mailboxID, sdiID
from cte 
where rn < 2

在 INNER JOIN SQL 服务器上获取 DISTINCT 记录

Get DISTINCT records on INNER JOIN SQL Server

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