獲取範圍的最小值和最大值

Question

下面的查詢會給我的ID列表我需要運行此之後立即執行更新：

SELECT TOP 5 WorkflowEventProcessingID 
FROM Master.WorkflowEventProcessing 
WHERE ProcessingToken IS NULL 
ORDER BY WorkflowEventProcessingId 

有沒有辦法讓分（55034）和最大值（55038）這個範圍的ID，在一個select語句，所以我可以做這樣的事情：

UPDATE WorkflowEventProcessing 
SET ProcessingToken = <guid here> 
WHERE WorkflowEventProcessingId >= @minId 
    AND WorkflowEventProcessingId <= @maxId 

我想是這樣的，但我的路要走：

DECLARE @minId INT 
DECLARE @maxId INT 

SELECT TOP 5 @minId = min(WorkflowEventProcessingID), @maxId = MAX(WorkflowEventProcessingID) 
FROM Master.WorkflowEventProcessing 
WHERE ProcessingToken IS NULL 
ORDER BY WorkflowEventProcessingId 

編輯

我不想因爲我得到這個死鎖做一個更新與子SELECT。所以我被告知將SELECT和UPDATE分開，給單獨的DELETE進程一個在UPDATE和SELECT之間運行的機會。

Answer 1

嘗試

DECLARE @min INT 
DECLARE @max INT 

select @min = min(WorkflowEventProcessingID), 
     @max = max(WorkflowEventProcessingID) 
from (
     SELECT TOP 5 WorkflowEventProcessingID 
     FROM Master.WorkflowEventProcessing 
     WHERE ProcessingToken IS NULL 
     ORDER BY WorkflowEventProcessingId 
    ) x 

然後做這樣的

UPDATE WorkflowEventProcessing 
SET ProcessingToken = <guid here> 
WHERE WorkflowEventProcessingId between @min and @max 

Answer 2

考慮使用子查詢，而不是一個範圍：

UPDATE WorkflowEventProcessing 
SET  ProcessingToken = <guid here> 
WHERE WorkflowEventProcessingId in 
     (
     SELECT TOP 5 WorkflowEventProcessingID 
     FROM Master.WorkflowEventProcessing with (updlock, holdlock) 
     WHERE ProcessingToken IS NULL 
     ORDER BY 
       WorkflowEventProcessingId 
     ) 

Answer 3

那豈不是更容易？：

UPDATE WorkflowEventProcessing 
SET ProcessingToken = <guid here> 
WHERE WorkflowEventProcessingId IN (SELECT TOP 5 WorkflowEventProcessingID 
FROM Master.WorkflowEventProcessing 
WHERE ProcessingToken IS NULL 
ORDER BY WorkflowEventProcessingId) 

好了，看到你的評論，你不能在UPDATE使用SELECT（雖然我真的不明白爲什麼你不能），並假設SQL Server的2005+，你可以嘗試以下方法：

;WITH CTE AS 
(
    SELECT TOP 5 WorkflowEventProcessingID 
    FROM Master.WorkflowEventProcessing 
    WHERE ProcessingToken IS NULL 
    ORDER BY WorkflowEventProcessingId 
) 
UPDATE CTE 
SET ProcessingToken = <guid here>