Re: how to make this database / query faster

On Sat, Mar 15, 2008 at 4:41 PM, mark <markkicks(at)gmail(dot)com> wrote:

> On Sat, Mar 15, 2008 at 4:37 PM, Richard Broersma <
> richard(dot)broersma(at)gmail(dot)com> wrote:
>
> > On Sat, Mar 15, 2008 at 4:21 PM, mark <markkicks(at)gmail(dot)com> wrote:
> >
> >
> > > select * from users where session_key is not Null order by id offset
> > > OFFSET limit 300
> > >
> > > One solution is to retain the last ID from the previous scan:
> >
> > SELECT *
> > FROM Users
> > WHERE session_key IS NOT NULL
> > AND id > your_last_id
> > LIMIT 300;
> >
>
> will this ensure that no row is repeated when i itereate over the table?
> what are the rows ordered by?
> thanks
>

Ya, sorry I forgot to include the order by.

SELECT *
FROM Users
WHERE session_key IS NOT NULL
AND id > your_last_id
ORDER BY id
LIMIT 300;

Yes there will not be any repeated rows sence you are using a order set
that who's ID are greated than the last set.