使用計數器來增加列號

Question

我需要爲每個NEW DocNumber增加一列（Counts）+1。所以如果DocNumber對於三列是相同的，則計數器將是1,2,3等。下面是代碼。我知道它會更新整個表格，而不是基於相同或不同的文檔編號。有人可以幫我理解這裏的邏輯嗎？

基本上，我要重新啓動計數器，當它擊中一個新TempDocNumber

DECLARE @DocTable Table (DetailID FLOAT, TempDocNumber FLOAT, Counts INT) 
INSERT INTO @DocTable (DetailID, TempDocNumber, Counts) 
SELECT DetailID, DocumentNumber, 0 FROM ChargebackDetailTempTable 


declare @Counter int 
Set @Counter = 0 
Update @Doctable 
SET @Counter = counts = @Counter + 1 

-- start counter over when new tempdocnumber 

Answer 1

你可以只創建您的插入這樣的：

DECLARE @DocTable Table (DetailID FLOAT, TempDocNumber FLOAT, Counts INT) 
INSERT INTO @DocTable (DetailID, TempDocNumber, Counts) 
SELECT DetailID, 
     DocumentNumber TempDocNumber, 
     ROW_NUMBER() OVER(PARTITION BY DocumentNumber ORDER BY DetailId) Counts 
FROM ChargebackDetailTempTable 

沒有UPDATE需要。

對於SQL Server 2000

假設DetailID是標識列，你可以試試下面的（同樣不UPDATE需要）：

DECLARE @DocTable Table (DetailID FLOAT, TempDocNumber FLOAT, Counts INT) 
INSERT INTO @DocTable (DetailID, TempDocNumber, Counts) 
SELECT DetailID, 
     TempDocNumber, 
     Counts = ( SELECT COUNT(T1.DetailID) + 1 
        FROM ChargebackDetailTempTable T1 
        WHERE T1.DetailID < T.DetailID and T1.TempDocNumber = T.TempDocNumber) 
FROM ChargebackDetailTempTable T