Access to the Row Number in a Query Result

Question

Hi everyone! I have this query:
select s.cod_score, ROW_NUMBER() OVER (ORDER BY s.cod_score) AS num
from score s
where s.categoria.cod_categoria='001' and s.gara.cod_gara='25251';
that returns:
COD_SCORE | NUM
00001     1
00002     2
00007     3
00009     4
00014     5
Now i want to display only the row with NUM='1', but how can i do that? I try with this:
select s.cod_score, ROW_NUMBER() OVER (ORDER BY s.cod_score) AS num
from score s
where s.categoria.cod_categoria='001' and s.gara.cod_gara='25251' and num=1;
but it tells me "%s: invalid identifier". How can i do?
Thanks in advance :)

Answer 1

986747 wrote:
Thanks everyone :) Now if i want to use the result of that query in an UPDATE how can i do? I try with this:
update score set posizione = '(first,1)' where score.golfista.n_tessera=(
select golf
from (select s.golfista.n_tessera as golf, ROW_NUMBER() OVER (ORDER BY s.cod_score) AS num
from score s
where s.categoria.cod_categoria='001' and s.gara.cod_gara='25251')
where num=1);
But it tells me that "SCORE"."GOLFISTA"."N_TESSERA" is an invalid identifier. Why? It is the primary key of the table golfista which has a REF in score...Hi,
what is the structure of table SCORE?
SCORE.GOLFISTA identifies a column. But SCORE.GOLFISTA.N_TESSERA seems not to be a valid value.
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Regards.
Al
Edited by: Alberto Faenza on Feb 13, 2013 4:33 PM