How to get 20rows at a time?

[badrinathn]

Hi,
In my application, I have to display 20 rows at a time when I click on a button(Using SERVLET).

what is the query for retreiving data between 21 to 40 records and so on...!

badrinath

[kgb]

Try that

select rownum,mem_id from member_tbl group by rownum,mem_id
having rownum between 21 and 40;

Best wishes!
Dmitri

[dragon99]

for example,if you want to have records from 10 to 20
do
select * from emp where rownum < 21
minus
select * from emp where rownum < 11;

Dragon

[badrinathn]

KGB,
This sql is a better one and works effectively
Badrinath

[chrisrlong]

Search for 'Window ROWNUM' on this forum and follow all the threads on this topic.

Here is one of them:
http://www.dbasupport.com/forums/sho...?threadid=5480

Here is the example from the threads:

SELECT
---OUTER.C1
FROM
---(
------SELECT
---------INNER.C1,
---------ROWNUM
------------AS QUERY_ROWNUM
------FROM
---------(
---------SELECT
------------C1
---------FROM
------------TABLE1
---------ORDER BY
------------C1
---------) INNER
------WHERE
---------ROWNUM (LESS THAN) 8
---) OUTER
WHERE
---OUTER.QUERY_ROWNUM >= 4

This is the best way to implement 'windowing' through a result set. The minus implementation is not optimal and kgb's example will not work if you need to do an ORDER BY, which is almost always a requirement of windowing.

HTH,

- Chris

[Heath]

Hey chrisrlong,

When you are composing your messages, type &lt; to get the < character. Keeps you from having to type (LESS THAN) in your examples.

I know that has been bugging you for a while. :)

HTH,

Heath

[chrisrlong]

haha

&lt&lt&lt&lt&lt&lt&lt&lt&lt&lt&lt&lt

Cool!

Thanks,

- Chris