I can't tell him how to do it but I think that what he actually wants is to
group by Cod_art returning

the minimum order cost in this area and also the order ID associated with
the minimum cost.

In the example you give, it will be order_id 1 because it has the minimum
cost, 10 as opposed to 15,

however if there are many with the same value, the whole idea makes less
sense.





--- In firebird-support@yahoogroups.com, "Alberto Pesce"
<palberto@...> wrote:

>
> I need to make this query:
> the lower cost of product ordered for each oreder.
>
> this work well
>
> SELECT cod_art, MIN(cost)
> FROM orders
> GROUP BY cod_art
>
> but this return each row in orders
>
> SELECT order_ID, cod_art, MIN(cost)
> FROM orders
> GROUP BY order_ID, cod_art
>
> How can I add order_ID in the first query?

Imagine you had the following table

Orders
======

order_ID Cod_art Cost
-------- ------- ----
1 1 10
2 2 20
3 1 15
4 3 20
5 3 22

Your first query would return

Cod_art MinCost
------- --------
1 10
2 20
3 20

Now Cod_art 1 could be order_id 1 OR 3??
Cod_art 2 will be 2

How could you possibly tell which should go first? You cant.
Alexandre's second query is probably the one you want.

Adam






++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Visit http://firebird.sourceforge.net and click the Resources item
on the main (top) menu. Try Knowledgebase and FAQ links !

Also search the knowledgebases at http://www.ibphoenix.com

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++





SPONSORED LINKS


Technical
<http://groups.yahoo.com/gads?t=ms&k=Technical+support&w1=Technical+support&
w2=Computer+technical+support&w3=Compaq+computer+technical+support&w4=Compaq
+technical+support&w5=Hewlett+packard+technical+support&w6=Microsoft+technic
al+support&c=6&s=196&.sig=-XIO8GxY6hqd3NaD5WSEyw> support

Computer
<http://groups.yahoo.com/gads?t=ms&k=Computer+technical+support&w1=Technical
+support&w2=Computer+technical+support&w3=Compaq+computer+technical+support&
w4=Compaq+technical+support&w5=Hewlett+packard+technical+support&w6=Microsof
t+technical+support&c=6&s=196&.sig=B29J78SYXnNTjjMFBMznqA> technical
support

Compaq
<http://groups.yahoo.com/gads?t=ms&k=Compaq+computer+technical+support&w1=Te
chnical+support&w2=Computer+technical+support&w3=Compaq+computer+technical+s
upport&w4=Compaq+technical+support&w5=Hewlett+packard+technical+support&w6=M
icrosoft+technical+support&c=6&s=196&.sig=7_je1A94xs82CFXUjEqA6g> computer
technical support


Compaq
<http://groups.yahoo.com/gads?t=ms&k=Compaq+technical+support&w1=Technical+s
upport&w2=Computer+technical+support&w3=Compaq+computer+technical+support&w4
=Compaq+technical+support&w5=Hewlett+packard+technical+support&w6=Microsoft+
technical+support&c=6&s=196&.sig=2zMAuRCo5cJrVBr1Bxa3_w> technical support

Hewlett
<http://groups.yahoo.com/gads?t=ms&k=Hewlett+packard+technical+support&w1=Te
chnical+support&w2=Computer+technical+support&w3=Compaq+computer+technical+s
upport&w4=Compaq+technical+support&w5=Hewlett+packard+technical+support&w6=M
icrosoft+technical+support&c=6&s=196&.sig=_ytYU7aXb57AVaeUfmvLcA> packard
technical support

Microsoft
<http://groups.yahoo.com/gads?t=ms&k=Microsoft+technical+support&w1=Technica
l+support&w2=Computer+technical+support&w3=Compaq+computer+technical+support
&w4=Compaq+technical+support&w5=Hewlett+packard+technical+support&w6=Microso
ft+technical+support&c=6&s=196&.sig=4hRo6NXYavRAbTkaYec5Lw> technical
support



_____

YAHOO! GROUPS LINKS



* Visit your group "firebird-support
<http://groups.yahoo.com/group/firebird-support> " on the web.

* To unsubscribe from this group, send an email to:
firebird-support-unsubscribe@yahoogroups.com
<mailto:firebird-support-unsubscribe@yahoogroups.com?subject=Unsubscribe>

* Your use of Yahoo! Groups is subject to the Yahoo!
<http://docs.yahoo.com/info/terms/> Terms of Service.



_____



[Non-text portions of this message have been removed]