Re: Re: Rownum

From: 刘继东 <liujd_at_cti.ac.cn>
Date: Wed, 19 Mar 2003 22:10:10 +0800
Message-Id: <24715.322369@fatcity.com>

Darrell Landrum,您好！

         thanx for your explaination.
I wonder :whether i can judge the select return. I find the rowNUM is not 0, is right?

• 2003-03-19 05:03:00 您在来信中写道：=======

>Santosh,
>
>Good question. Actually these 2 are not related.
>Rowid is an actual attribute assigned to each row of a table and is unique.
>Rownum is logically assigned to rows returned in a query (nothing to do with the table). It is assigned sequentially as rows are returned (meaning if you can't have a rownum 2 until you've gotten a rownum 1).
>
>Ex.
>SQL> select rowid from dual;
>
>ROWID
>------------------
>AAAACsAABAAAAGkAAA
>
>SQL> select rownum from dual;
>
> ROWNUM
>----------
> 1
>
>SQL> select rownum from dual where rownum=2;
>
>no rows selected
>
>SQL> select rownum from dual where rownum < 2;
>
> ROWNUM
>----------
> 1
>
>
>Hope this was helpful,
>Darrell
>
>
>
>
>>>> vsantosh_at_psi.soft.net 03/19/03 03:43AM >>>
>Hello list,
>
> I wanted to know the concept of Rownum.. Is it similar to Row Id ?
>
>Thanks and Regards,
>Santosh
>
>
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• = = = = = = = = = = = = = = = = = = =

　　　　　　　　致

礼！                                    

　　　　　　　　刘继东

Received on Wed Mar 19 2003 - 08:10:10 CST