Hi,
>>> SELECT zone from fedex_zones where zip = 94947
>>> select price from fedex_rates where zone = '8' and weight = '25'
your query should be :
select price from fedex_rates, fedex_zones
where fedex_zones.zip = 94947
and fedex_zones.zip = fedex_rates.zip
and fedex_rates.weight = '25'
Mathias
Selon Scott Haneda <[EMAIL PROTECTED]>:
> on 5/10/05 8:29 PM, Peter Brawley at [EMAIL PROTECTED] wrote:
>
> > Scott,
> >
> >> ...In part, my trouble is that I need to take the resuling zone from the
> >> first
> >> select and use that to determine the field name.
> >
> >> I can easily do this in my code in 2 selects, but was hoping to be able to
> >> get the price back in just one select, if possible...
> >
> > If you have control over the data model, it would be good to change the
> > structure of fedex_rates to (id int PK, zone int, weight int, price
> > decimal(10,2)), getting rid of the denormalised z_* columns which are
> causing
> > you problems. Then a one-stage query would just be SELECT price FROM
> > fedex_rates WHERE zone=8 AND weight=12.
> >
> > If you're stuck with the table structure you show, you're stuck with two
> > queries. If these lookup tables aren't large, there's probably not much
> > performance to be gained from hiding the two stages inside a stored
> procedure,
> > but if you want a one-step, IMO that's the way to go.
>
> Ok, I changed the tables around a little, I can not really do this all in
> one table, since the data gets made new often by fedex, at any rate, (no pun
> intended :-))...
>
> mysql> describe fedex_zones;
> +-------+---------+------+-----+---------+----------------+
> | Field | Type | Null | Key | Default | Extra |
> +-------+---------+------+-----+---------+----------------+
> | id | int(11) | | PRI | NULL | auto_increment |
> | zip | char(5) | | UNI | | |
> | zone | char(2) | | | | |
> +-------+---------+------+-----+---------+----------------+
>
> mysql> describe fedex_rates;
> +--------+---------------+------+-----+---------+----------------+
> | Field | Type | Null | Key | Default | Extra |
> +--------+---------------+------+-----+---------+----------------+
> | id | int(11) | | PRI | NULL | auto_increment |
> | weight | int(11) | | | 0 | |
> | zone | int(11) | | | 0 | |
> | price | decimal(10,2) | | | 0.00 | |
> +--------+---------------+------+-----+---------+----------------+
>
> so first, I need to get the zone I am in, which is a:
> SELECT zone from fedex_zones where zip = 94947
> > 8
>
> If the result in that case is 8, then I can
> select price from fedex_rates where zone = '8' and weight = '25'
>
> For some reason, this join is still not screaming out at me, or maybe I have
> it right, and my data is in duplication, any help is appreciated.
> --
> -------------------------------------------------------------
> Scott Haneda Tel: 415.898.2602
> <http://www.newgeo.com> Novato, CA U.S.A.
>
>
>
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