ROWNUM question ???

From: Janet Linsy <janetlinsy_at_yahoo.com>
Date: Fri, 08 Feb 2002 17:36:40 -0800
Message-ID: <F001.0040B040.20020208172913@fatcity.com>

Hi,

I have a table like this:

SQL> select * from test;

        ID PRICE
---------- ----------

         1          1
         1          3
         1          4
         1          5
         1          6

I need to get the second largest price and I was using the ROWNUM.

For the following statement, the result makes sense: SQL> select * from test where rownum < (select count(*) -1 from test);

        ID PRICE
---------- ----------

         1          1
         2          3
         3          4

But the rest twos didn't return anything:

SQL> select * from test where rownum=(select count(*)
-1 from test); -- supposed to return 5 ???

no rows selected

SQL> select * from test where rownum > (select count(*) -1 from test); -- supposed to return 6 ???

no rows selected

I vaguely remember that ROWNUM only works in < case, why is that? Thank you!

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Author: Janet Linsy
  INET: janetlinsy_at_yahoo.com

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