更新具有聚集自加入的查询

Question

我正在使用自加入来获取年度至今的总数。这工作：

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 

它给了我一个运行总列，重置为每个员工。

现在我想将它变成一个UPDATE查询将这些数据放入一个新列。这是如何完成的？

Answer 1

您是否尝试过：在一个事务

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 

运行，以确保它产生所需的输出。