Query to get all the data in specific range

Question

Dear All,
I have a table and having 50 records. So i want to fetch the records from specified range.
Ex:
1. I want to fetch the records from first 1 to 10 records ( range i will pass) or i want to fetch from 20 to 30 records.
Please help regarding that

Answer 1

YKING wrote:
Dear Thanks for replying,
i want to display the first 10 records/display the between 20 to 30 range records (from 20 th records to 30 th records). I m using below query one is working but another is not working. pelase advise what wrong with one which is not working
Not working :-
select rownum , b.*
from
(select rownum, a.* from table_name a
order by colum1) b
where rownum between &a and &b
working :-
select *
from (select rownum rn, a.*
from table_name a
order by vesl_master_num)
where rn between &s and &q;What's wrong with the one that is not working ... ok...
You are using "rownum" which is a psuedo column assigned to the returned rows. So if row 1 is not returned then there will never be a rows 2, 3, 4 etc. so you can't say you want e.g. rownum between 10 and 20 because rows 1 to 9 haven't been returned, so there's no such things as a row 10,11,12 etc.
In the query that's working you've kind of captured the rownum for all the rows and then you can restrict it. However, the ordering of the data still isn't right in that last example, because the ordering takes place after the rownum is assigned.
So what you really want is...
select *
from (select rownum rn, a.*
       from table_name a 
      order by vesl_master_num)
where rn between &s and &q;which applies the ordering first, then applies the row numbers outside that, and then restricts to certain row numbers outside that.