Search Postgresql Archives

Re: Select first ten of each category?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Wed, 12 Apr 2006, Benjamin Smith wrote:

> I'm stumped on this one...
>
> I have a table defined thusly:
>
> create table items (
> id serial,
> category integer not null references category(id),
> name varchar not null,
> price real,
> unique(category, name));



I think this should work....

select * from items
order by price desc
limit 10;


Cheers,

  Brent Wood

>
> It has a LARGE number of entries. I'd like to grab the 10 most expensive items
> from each category in a single query. How can this be done? Something like
>
> Select items.*
> FROM items
> where id IN (
> 	select firstTen(id) FROM items
> 	group by category
> 	ORDER BY price DESC
> 	)
> ORDER BY price desc;
>
> But I've not found any incantation to make this idea work...
>


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Postgresql Jobs]     [Postgresql Admin]     [Postgresql Performance]     [Linux Clusters]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Postgresql & PHP]     [Yosemite]
  Powered by Linux