Why this SQL does not work?

From: Rao, Maheswara <Maheswara.Rao_at_Sungardp3.com>
Date: Wed, 11 Jul 2001 13:29:39 -0700
Message-ID: <F001.00347FCA.20010711134404@fatcity.com>

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

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Author: Rao, Maheswara
  INET: Maheswara.Rao_at_Sungardp3.com

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Received on Wed Jul 11 2001 - 15:29:39 CDT