Question

我对TFS数据库使用以下查询。有问题的工作项目从Active到其他州再到活跃。我想使用Rank（）Over Partition将两组“活动”状态视为单独的组，而不是继续使用第一个活动组停止的第二个活动组的编号。

;with cte as
(
    SELECT 
        dense_rank() over(partition by ID, State order by ID,  Rev) as rn
        , ID
        , Rev
        , State
        , Reason
        , NamePart
        --, *
    FROM dbo.WorkItemsWere Hist
        Left JOIN Constants Cs WITH (nolock)
            ON Hist.[Changed by] = Cs.ConstID

    WHERE ID = 38728
)
SELECT * 
FROM cte
--WHERE rn = 1
ORDER BY ID, Rev

下面是我得到的结果集，其中添加了一个“Desired rn”列，以显示我想要的内容：

Desired rn rn    ID          Rev         State                            
---------- ----- ----------- ----------- -----------------------------------
1          1     38728       1           Proposed                            
1          1     38728       2           Active                              
2          2     38728       3           Active                              
3          3     38728       4           Active                              
4          4     38728       5           Active                              
5          5     38728       6           Active                              
6          6     38728       7           Active                              
7          7     38728       8           Active                              
1          1     38728       9           Dev Complete                        
1          1     38728       10          Resolved; Queued for Build to Test  
2          2     38728       11          Resolved; Queued for Build to Test  
3          3     38728       12          Resolved; Queued for Build to Test 
1          8     38728       13          Active                             
2          9     38728       14          Active                             
1          2     38728       15          Dev Complete

可以通过调整语法来完成吗？

Answer 1

使用ROW_NUMBERS的差异：

WITH CteGrp AS(
    SELECT *,
        Grp = ROW_NUMBER() OVER(PARTITION BY ID ORDER BY Rev)
                - ROW_NUMBER() OVER(PARTITION BY ID, State ORDER BY Rev)
    FROM tbl
),
Cte AS(
    SELECT *,
        rn = ROW_NUMBER() OVER(PARTITION BY ID, Grp ORDER BY Rev)
    FROM CteGrp
)
SELECT
    rn, ID, Rev, State 
FROM Cte
ORDER BY ID, Rev

DEMO

阅读Jeff Moden的文章，了解有关此技术的更多信息：

Group Islands of Contiguous Dates (SQL Spackle) - SQLServerCentral

SQL Server Rank（）Over Partition w / Back和Forth值

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