更新具有聚集自加入的查詢

Question

我正在使用自加入來獲取年度至今的總數。這工作：

SELECT tc.EmployeeID, tc.TimeCardNum, tc.Tax, SUM(inr.Tax) AS YTDTax 
FROM TimeCards tc 
JOIN (
     SELECT EmployeeID, TimeCardNum, Tax 
     FROM TimeCards 
) AS inr 
ON inr.EmployeeID = tc.EmployeeID 
AND inr.TimeCardNum <= tc.TimeCardNum 
GROUP BY tc.EmployeeID, tc.TimeCardNum, tc.Tax 
ORDER BY tc.EmployeeID, tc.TimeCardNum 

它給了我一個運行總列，重置爲每個員工。

現在我想將它變成一個UPDATE查詢將這些數據放入一個新列。這是如何完成的？

Answer 1

您是否嘗試過：在一個事務

UPDATE a 
SET a.YTDTax=b.YTDTax 
FROM TimeCards a 
INNER JOIN (
    SELECT tc.EmployeeID, tc.TimeCardNum, tc.Tax, SUM(inr.Tax) AS YTDTax 
    FROM TimeCards tc 
    JOIN (
      SELECT EmployeeID, TimeCardNum, Tax 
      FROM TimeCards 
    ) AS inr 
    ON inr.EmployeeID = tc.EmployeeID 
    AND inr.TimeCardNum <= tc.TimeCardNum 
    GROUP BY tc.EmployeeID, tc.TimeCardNum, tc.Tax 
) b on a.EmployeeID=b.EmployeeID 
AND a.TimeCardNum = b.TimeCardNum 

運行，以確保它產生所需的輸出。