Re: how to make this database / query faster

"Richard Broersma" <richard.broersma@xxxxxxxxx> · Sat, 15 Mar 2008 16:45:46 -0700

On Sat, Mar 15, 2008 at 4:41 PM, mark <markkicks@xxxxxxxxx> wrote:

On Sat, Mar 15, 2008 at 4:37 PM, Richard Broersma <richard.broersma@xxxxxxxxx> wrote:

On Sat, Mar 15, 2008 at 4:21 PM, mark <markkicks@xxxxxxxxx> 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.