Question

我对简单的SQL查询有疑问。

这是我在Access 2013中的查询：

SELECT Shippers.Shipper_ID, Shippers.ShipperName, SUM(Orders.TotalPrice) AS TotPr FROM Orders
LEFT JOIN Shippers
ON Orders.Shipper_ID=Shippers.Shipper_ID
GROUP BY Shippers.Shipper_ID, Shippers.ShipperName
ORDER BY Shippers.ShipperName;

......它完美无缺。但是如何将别名列（TotPr）放入ORDER BY？

感谢您的帮助：）

Answer 1

您可以使用以下公式：

SELECT Shippers.Shipper_ID, Shippers.ShipperName, SUM(Orders.TotalPrice) AS TotPr
FROM Orders LEFT JOIN
     Shippers
     ON Orders.Shipper_ID=Shippers.Shipper_ID
GROUP BY Shippers.Shipper_ID, Shippers.ShipperName
ORDER BY Shippers.ShipperName, SUM(Orders.TotalPrice);

Answer 2

使用SUM(Orders.TotalPrice)代替别名，您需要汇总

所以你的查询将是：

SELECT Shippers.Shipper_ID, Shippers.ShipperName, SUM(Orders.TotalPrice) AS TotPr
FROM Orders LEFT JOIN
     Shippers
     ON Orders.Shipper_ID=Shippers.Shipper_ID
GROUP BY Shippers.Shipper_ID, Shippers.ShipperName
ORDER BY Shippers.ShipperName, SUM(Orders.TotalPrice);

Answer 3

Order By通常不喜欢计算列，因为大多数引擎都在内部计算SQL。试试这个：

SELECT Shipper_ID, ShipperName, TotPr
FROM
(SELECT Shippers.Shipper_ID, Shippers.ShipperName, SUM(Orders.TotalPrice) AS TotPr FROM Orders
LEFT JOIN Shippers
ON Orders.Shipper_ID=Shippers.Shipper_ID
GROUP BY Shippers.Shipper_ID, Shippers.ShipperName) ShipQuery
ORDER BY ShipQuery.ShipperName, ShipQuery.TotPr;

（免责声明：我没有对此进行测试。）

访问SQL-Query ORDER BY Alias-Column

3 个答案: