Selecting specific number of records

Hellow
How can we query certain number of records from table. For example if a table has thousands of records and i wish to query
1. first 500 records
2. Records between 500 and 1000 or between <anynumber> to <any number>
3. Records less than <some number>
I cannot perform the same operation from a primary key as it is not in serial.
I tried to use ROWNUM, but i cannot use this when i want to select rows less than 100 or rows between 100 and 200...
How can i accomplish this
Regards
Sunny

1. first 500 records
select *
from ( YOUR_QUERY_GOES_HERE -- including the order by )
where rownum <= 500Another way using analytical functions can be found in the documentation Top N Ranking
2. Records between 500 and 1000 or between
<anynumber> to <any number>
select *
from ( select a.*, rownum rnum
 from ( YOUR_QUERY_GOES_HERE -- including the order by ) a
 where rownum <= MAX_ROWS )
where rnum >= MIN_ROWShttp://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:127412348064
3. Records less than <some number>
select *
from my_table
where my_column < <some number>

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<BLOCKQUOTE>quote:<HR>Originally posted by Chen Zhao ([email protected]):
If you are using Oracle 8i, you can use ROWNUM to specify the specific number of records. You can see the ROWNUM by querying:
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CHEN<HR></BLOCKQUOTE>
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