帶有增量的分組數據的SQL更新

Question

我有一個包含[更新值]，[日期]，[時間]，[電話號碼]和整數自動編號/主鍵列的列表。

我想將表格更新爲一組，以便將日期和電話號碼分組在一起（即，如果兩個或更多記錄具有相同的日期和電話，則它們是「組」的一部分），但是然後在該組的最早時間記錄中放置一個「1」，然後在該組的最早時間記錄中輸入「2」，等等。

只更新組的計數很簡單， m試圖找出如何使用基於時間排序的增量值更新每個組的牆。

Answer 1

UPDATE yt 
    SET [update value] = q.RowNum 
     FROM YourTable yt 
      INNER JOIN (SELECT PKColumn, 
           ROW_NUMBER() OVER(PARTITION BY [date], [phone number] ORDER BY [time]) AS RowNum 
          FROM YourTable) q 
       ON yt.PKColumn = q.PKColumn; 

你也可以用CTE做到這一點：

WITH cteRowNum AS (
    SELECT [update value], 
      ROW_NUMBER() OVER(PARTIION BY [date], [phone number] ORDER BY [time]) AS RowNum 
     FROM YourTable 
) 
UPDATE cteRowNum 
    SET [update value] = RowNum; 

Answer 2

看一看的ROW_NUMBER（）函數，例如

SELECT 
    Date, 
    PhoneNumber, 
    Time, 
    ROW_NUMBER() OVER (PARTITION BY Date, PhoneNumber ORDER BY Time ASC) AS IndexInGroup 
    FROM 
    MyTable 

Answer 3

此行將創建您正在查找的數字。

ROW_NUMBER() OVER (PARTITION BY [phone number], [date] ORDER BY [date] ASC) Time_Sequencer