From: Andras Kutrovics <n-drew@freemail.hu>
To: pgsql-sql@postgresql.org
Subject: Simple SQL Question
Date: Fri, 05 Nov 2004 17:54:41 +0100
Message-ID: <418BB051.6070808@freemail.hu> (raw)
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
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Subject: Re: Simple SQL Question
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