SQL-group by into列更新

我在玩AdvantureWorks DB，但我沒有SalesOrderDetail表上的實際銷售值。此行應該包含LineTotal通過訂單ID彙總。SQL-group by into列更新

我需要輸入這些值轉化爲實際的銷售列每個訂單ID行：

select SUM(LineTotal) as ActualSales 
from Sales.SalesOrderDetail 
group by SalesOrderID

來源

2012-12-25 uvluni

你需要通過向查詢添加要分組的字段：

select SalesOrderID, sum(LineTotal) as ActualSales 
from SalesOrderDetail 
group by SalesOrderID

來源

2012-12-25 08:14:11 craigmj

craigmj，這種說法提出ActualSales作爲別名，但不會更新ActualSales列中的值。我錯過了什麼嗎？ – uvluni

你可以JOINUPDATE像這樣：

UPDATE od 
SET od.ActualSalesColumn = g.ActualSales 
FROM Sales.SalesOrderDetail od 
INNER JOIN 
(
    SELECT 
     SalesOrderDetail, 
     SUM(LineTotal) as ActualSales 
    FROM Sales.SalesOrderDetail 
    GROUP BY SalesOrderID 
) g ON od.SalesOrderID = g.SalesOrderID;

或者：的CTE：

WITH ActualSales 
AS 
(
    SELECT 
     SalesOrderDetail, 
     SUM(LineTotal) as ActualSales 
    FROM Sales.SalesOrderDetail 
    GROUP BY SalesOrderID 
) 
UPDATE od 
SET od.ActualSalesColumn = g.ActualSales 
FROM Sales.SalesOrderDetail od 
INNER JOIN ActualSales g ON od.SalesOrderID = g.SalesOrderID;

來源

2012-12-25 08:21:08

UPDATE x 
SET x.ActualSales = x.NewActualSales 
FROM (
     SELECT ActualSales, SUM(LineTotal) OVER (PARTITION BY SalesOrderID) AS NewActualSales 
     FROM Sales.SalesOrderDetail 
    ) x

來源

2012-12-25 10:19:09

SQL-group by into列更新

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