Re: Best way to do this query?
Date: 17 Jan 2007 07:37:15 -0800
Message-ID: <1169048235.390892.206370_at_11g2000cwr.googlegroups.com>
Marshall schreef:
> I run in to this kind of query every so often. I wonder if
> there's a canonical best way to do it?
>
> Consider the following schema:
>
> Invoices:{invoiceid, customerid, date, amount}
>
> Each invoice has an id, the id of the customer who opened the
> invoice, the date of the creation of the invoice, and the amount.
>
> If I want to know the date of every customer's most recent invoice,
> that's easy:
There could be more invoices with the same date.
>
> select customerid, max(date) from Invoices group by customerid
>
> But suppose I also want to know the id and amount of that particular
> invoice?
>
>
> Marshall
I would not call this a 'canonical' way but....
Carlos Received on Wed Jan 17 2007 - 16:37:15 CET