Re: rownum question

ptsao_at_sequeltech.com wrote:
>
> Hi,
>
> I was able to do
>
> select * from table where rownum = 1;
> select * from table where rownum <= 20;
> update table
> set id = rownum;
>
> but, I CAN NOT do
>
> select * from table where rownum = 2;
> select * from table where rownum = 3;
> ...
>
> Can someone tell me why?
>
> Thanks,
>
> Phil Tsao

It's kind of like your age - you can't be 2 unless you were 1 previously. Rownum is incremented as rows are returned from the query. Since the first row is always rownum 1 but your where clause excludes that row from the return set, you can never get to rownum 2. The only valid way to use rownum is =1 or <N. Anything else will not return any rows.

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Allen Kirby			AT&T ITS Production Services
akirby_at_att.com			Alpharetta, GA.