Newbie - What's wrong with following? -- sql server (alternate)

sql server (alternate) : Newbie - What's wrong with following?

toedipper
3/31/2005 12:04:27 AM

Hi,

This simple code using the Northwind db and SQL 2000...when I have the 2nd
from botton line commented out as I do now it works well and give me a
summary of the orders and totals from the [order details] table, nothing
special there.

However, if I uncomment the 'where ordervalue > 500' line and run it I get
an error that says "Invalid column name 'ordervalue' "

Any ideas?

Thanks,

td.

select
o.orderid
,o.orderdate
,c.companyname
,sum(unitprice * quantity) as ordervalue
from
orders o
join
customers c
on
o.customerid = c.customerid
join
[order details] od
on o.orderid = od.orderid
--where ordervalue > 500
group by o.orderid, c.companyname, o.orderdate

Lefty
3/31/2005 1:15:03 PM

[quoted text, click to view]

it is a bit complicated, but to get a useful error message try this instead
when joining you cant use a where on an agregate like that because the
column may not exist, it is based on the results

select
o.orderid
,o.orderdate
,c.companyname
,sum(unitprice * quantity) as ordervalue
from
orders o
join
customers c
on
o.customerid = c.customerid
join
[order details] od
on o.orderid = od.orderid
where sum(unitprice * quantity) > 500
group by o.orderid, c.companyname, o.orderdate

and here is how to make it work;

select
o.orderid
,o.orderdate
,c.companyname
,sum(od.unitprice * od.quantity) as ordervalue
from
orders o
join
customers c
on
o.customerid = c.customerid
join
[order details] od
on o.orderid = od.orderid

group by o.orderid, c.companyname, o.orderdate
having sum(od.unitprice * od.quantity) > 500

toedipper
3/31/2005 8:06:00 PM

Thanks a lot, done the trick.

td.

[quoted text, click to view]

Erland Sommarskog
3/31/2005 10:22:35 PM

toedipper (send_rubbish_here734@hotmail.com) writes:
[quoted text, click to view]

The only place in the query where you can use an alias is in the ORDER
BY clause.

However, you can use a derived table:

SELECT orderid, orderdate, companyname, ordervalue
FROM (select
o.orderid
,o.orderdate
,c.companyname
,sum(unitprice * quantity) as ordervalue
from
orders o
join
customers c
on
o.customerid = c.customerid
join
[order details] od
on o.orderid = od.orderid
group by o.orderid, c.companyname, o.orderdate) AS x
where ordervalue > 500

Another way is to write the query as:

select
o.orderid
,o.orderdate
,c.companyname
,sum(unitprice * quantity) as ordervalue
from
orders o
join
customers c
on
o.customerid = c.customerid
join
[order details] od
on o.orderid = od.orderid
group by o.orderid, c.companyname, o.orderdate
having SUM(UnitPrice * Quantity) > 500

--
Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se

Books Online for SQL Server SP3 at

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