Re: Why this SQL does not work?

rownum will not work for "rownum = anything_but_1".

this is because rownum is assigend after the cursor is fetched.

oracle fetches the first row and assigns a rownum of 1, checks where rownum = 5 condition, finds that it is not satisfied and discards the row. it fetches another row, and since the prev row is discarded this new row will have a rownum of 1 and so it is also discarded...

thus only if you give rownum = 1 or rownum < x it will work.

the following will not work

rownum = x where x >1
rownum > x where x > 0

babu

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, July 11, 2001 4:44 PM

> List,
>
> Following are two SQL statements. The first SQL statement works OK (where
> ROWNUM < 5 is used). The second SQL statement does not return any rows
> (where ROWNUM = 5 is used). This table contains 200 records.
>
> First SQL statement
> -------------------
> SELECT * FROM
> (SELECT PROCESSED_DATE
> FROM TRADES WHERE PROCESSED_STATUS = 0
> ORDER BY ENTRY_DATE)
> WHERE ROWNUM < 5
>
> Second SQL statement
> --------------------
> SELECT * FROM
> (SELECT PROCESSED_DATE
> FROM TRADES WHERE PROCESSED_STATUS = 0
> ORDER BY ENTRY_DATE)
> WHERE ROWNUM = 5
>
> ---------------
> Question:
>
> Why second SQL statement does not work?
>
> I would be thankful for the clarification.
>
> Thanks,
>
> Rao
> Maheswara.Rao_at_Sungardp3.com
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
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> Author: Rao, Maheswara
> INET: Maheswara.Rao_at_Sungardp3.com
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-- 
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Author: orclbabu
  INET: orclbabu_at_hotmail.com

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