SELECT query problem

Hi all

Need select records less where Rownum < = 100, a table in which the records are classified by a field in a query, but after stopped in the ordering of rownum gets changes.
 
with t as (select 1 a,'d' b from dual 
union select 8 a,'t' b from dual 
union select 3 a,'u' b from dual 
union select 7 a,'k' b from dual ) 
select t.*,rownum from t order by 2 ;


A B ROWNUM 
1 d 1 
7 k 3 
8 t 4 
3 u 2 
Now I want to select records where ronum < = 2 as below, this can be done by changing only in where clause and do not touch the query select, as can do a nested query I but need to do it by changing only in where clause.
 
A B ROWNUM 
1 d 1 
7 k 3 
Thanks in advance

Thanks and greetings
Sanjay

Published by: Sanjay March 29, 2011 06:26

Hi, Sanjay

Sanjay wrote:
Hi all

Need select records less where Rownum<= 100,="" from="" a="" table="" in="" which="" records="" are="" ordered="" by="" a="" field="" in="" a="" query="" but="" after="" doing="" order="" by="" the="" rownum="" ordering="" gets="">


with t as (select 1 a,'d' b from dual
union select 8 a,'t' b from dual
union select 3 a,'u' b from dual
union select 7 a,'k' b from dual )
select t.*,rownum from t order by 2 ;

A B ROWNUM
1 d 1
7 k 3
8 t 4
3 u 2 

Now I want to select records where ronum<= 2="" like="" below,="" can="" this="" be="" done="" by="" changing="" only="" in="" where="" clause="" and="" not="" touching="" the="" select="" query="" as="" it="" can="" be="" done="" by="" nested="" query="" i="" but="" need="" to="" do="" it="" by="" changing="" only="" in="" where="">


A B ROWNUM
1 d 1
7 k 3 

No, there is no way to get these results by changing only the WHERE clause. As it is, you have no column or expression in the main query that indicates how the lines are classified according to b, which is exactly what to test in the WHERE clause. (Remember, ROWNUM is assigned before ORDER BY is done in the same auxiliary request). You must add a using ROWNUM or ROW_NUMBER analytic function. either way requires some preparation to be done in a subquery.

For example, the following query has an ORDER BY clause, added to the request slot, so that ROWNUM in the main query will be more arbitrary:

with t as (select 1 a,'d' b from dual
union select 8 a,'t' b from dual
union select 3 a,'u' b from dual
union select 7 a,'k' b from dual
ORDER BY  b                              -- Added
)
SELECT    t.*
,       ROWNUM
FROM        t
WHERE       ROWNUM     <= 2     -- Added
ORDER BY  b
;

Output:

`        A B     ROWNUM
---------- - ----------
         1 d          1
         7 k          2

It is no coincidence that the numbers in the column ROWNUM are 1 and 2. If you want really to arbitrary numbers (such as 1 and 3), you will need an another subquery.

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