通过别名列访问SQL查询ORDER

Question

I have a question about a simple sql-query.

This is my query in Access 2013:

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;

... and it work perfect. But how can I put the alias-column (TotPr) in ORDER BY?

Thank you for help :)

Answer 1

You can use the formula:

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

Use SUM(Orders.TotalPrice) instead of the aliased name, you want the aggregation

so your query would be:

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 generally doesn't like calculated columns, due to the way SQL is figured internally by most engines. Try this:

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;

(Disclaimer: I didn't test this.)