Simple SQL Question

Hi All!

In one of my application, I would like to implement incremental
fetching. The problem is that I would like to run it
from a stateless application server, so I have to tell where
to begin fetching data. It is simple for a table which has single column
primary key, but causes difficulties (at least for me) in
a more-column primary key..

Let say I have a table wich has the primary key: itemkey,location

table1
------
itemkey
location
...
--------


select * from table1 LIMIT x

gives me the first x row of the result.
After that, I save the last value, and next time, I adjust
the query as

select * from table1 where itemkey>:lastvalue LIMIT x

that should be enough for an 'Item' table, but I have another
column in the primary key.

let say, I have the following in Table1:

itemkey        location
------------------------
00001        00001
00001        00002
...
00005        00001
00005        00002
00005        00003 <--- lets say this is the last value

next time i want to run a query, which starts from

00005        00004
00006        00005

and so on..

How can I specify that in sql?
I dont want to use cursor:), I would like to do it in plain sql.
(It it is possible).

Thank you in advance

Andras Kutrovics