SQL子查询协助

Question

Use a sub-query that returns the monetary values of all orders that have discounts -- greater than 15% -- List the orderid and the order value this last with the highest value at the top.

I keep getting an error message.

USE Northwind
GO

SELECT 
    SUM(od.orderid) As OrderID, 
    AS [Order Values]
FROM 
    [Order Details] od
WHERE 
    od.Discount = (SELECT od.Discount
                   FROM [Order Details] od
                   GROUP BY od.discount
                   HAVING od.discount >.15)
GROUP BY 
    od.quantity, od.discount, od.UnitPrice
ORDER BY 
    [Order Values] ASC;

Error is:

Msg 156, Level 15, State 1, Line 2
Incorrect syntax near the keyword 'AS'.
Msg 156, Level 15, State 1, Line 9
Incorrect syntax near the keyword 'GROUP'.

Answer 1

Here is your query:

SELECT SUM(od.orderid) As OrderID, 
AS [Order Values]
FROM [Order Details] od
WHERE od.Discount = (SELECT od.Discount
                     FROM [Order Details] od
                     GROUP BY od.discount
                     HAVING od.discount >.15
                    )
GROUP BY od.quantity, od.discount, od.UnitPrice
ORDER BY [Order Values] ASC;

It has at least two syntactic errors. The AS [Order Values] is just lingering out there. Incorrectly. Plus, you have = to a subquery that is likely to return multiple rows. Even after you fix these problems, the query is not going to do what you want, I don't think.

EDIT:

THe query that you want might be:

SELECT od.orderid, sum( od.quantity * od.UnitPrice * (1 - od.discount)) as value
FROM [Order Details] od
GROUP BY od.orderid
HAVING sum(case when od.discount > 0.15 then 1 else 0 end) > 0
ORDER BY value desc;

Answer 2

The following lines have problem: SELECT SUM(od.orderid) As OrderID, AS [Order Values]

There is nothing specified before AS in the 2nd line. Either you have missed a column name before as or you need to remove the "AS OrderID," One additional point: Change the = operator of WHERE clause to IN. Tis is to avoid error if your subquery returns multiple values.

Your query will look like this: USE Northwind GO

SELECT SUM(od.orderid) AS [Order Values] FROM [Order Details] od WHERE od.Discount IN (SELECT od.Discount FROM [Order Details] od GROUP BY od.discount HAVING od.discount >.15) GROUP BY od.quantity, od.discount, od.UnitPrice ORDER BY [Order Values] ASC;