| From: | "James B(dot) Byrne" <byrnejb(at)harte-lyne(dot)ca> |
|---|---|
| To: | "Andy Colson" <andy(at)squeakycode(dot)net> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Help with join syntax sought |
| Date: | 2009-05-19 21:16:30 |
| Message-ID: | 43368.216.185.71.24.1242767790.squirrel@webmail.harte-lyne.ca |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
On Tue, May 19, 2009 17:02, Andy Colson wrote:
>
> so: select max(name), type from food group by type
> works cuz we only get one name (the max name) back for each type.
>
> or: select name, type from food group by type, name
> which in our example is kinda pointless, but still, give us the
> distinct
> items for "type, name".
Thanks. I think I am beginning to see this. So, if there are more
than one type for a given currency code and I do not select and
group by type then the having count(whatever) = 1 means that these
rows are not selected either. Is that correct?
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