From: | Jeff Hoffmann <jeff(at)propertykey(dot)com> |
---|---|
To: | Bernie Huang <bernie(dot)huang(at)ec(dot)gc(dot)ca> |
Cc: | PGSQL-SQL <pgsql-sql(at)postgresql(dot)org>, PHP-PGSQL <php-pgsql(at)linuxports(dot)com> |
Subject: | Re: Fetch the latest log for each product |
Date: | 2000-08-17 17:33:03 |
Message-ID: | 399C21CF.77C26118@propertykey.com |
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Thread: | |
Lists: | pgsql-sql |
Bernie Huang wrote:
>
> Hi,
>
> I bet people have asked this question several times, but oh well, please
> do anwser again. Thanks. =)
>
> I have a product table and a log file.
>
> product_tb
> -----------
> prod_id
> prod_name
> ...
>
> log_tb
> ---------
> log_id
> prod_id
> cust_id
> transact_date
> ...
>
> How do I fetch the latest log for each product according to transaction
> date?
>
> - Bernie
here's how i would do it, i guess.
select p.prod_name, l.prod_id, max(l.transact_date) as
last_transaction
from log_tb l, prod_tb p
where l.prod_id=p.prod_id
group by p.prod_name, l.prod_id;
i think that's what you want, at least...
--
Jeff Hoffmann
PropertyKey.com
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