>From the Oracle docs (SQL Reference)
"For each row returned by a query, the ROWNUM pseudocolumn returns a number
indicating the order in which Oracle selects the row from a table or set of
joined rows. The first row selected has a ROWNUM of 1, the second has 2, and
so on.
...
Conditions testing for ROWNUM values greater than a positive integer are
always false. For example, this query returns no rows:
SELECT * FROM emp
WHERE ROWNUM > 1;
The first row fetched is assigned a ROWNUM of 1 and makes the condition
false. The second row to be fetched is now the first row and is also
assigned a ROWNUM of 1 and makes the condition false. All rows subsequently
fail to satisfy the condition, so no rows are returned."
Henry
-----Original Message-----
Sent: Wednesday, July 11, 2001 6:00 PM
To: Multiple recipients of list ORACLE-L
First guess .... There are only 4 rows of data returned ??
Change the first query to
Where rownum <= 5
and let us know if you actually get that 5th row. If you did not then I
would say that the queries are both working but there are only 4 rows that
match the criteria.
-----Original Message-----
Sent: Wednesday, July 11, 2001 4:44 PM
To: Multiple recipients of list ORACLE-L
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
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