RE: Slow running Query.

From: Thomas Biju <BThomas_at_br-inc.com>
Date: Tue, 22 Jun 2004 12:41:16 -0500
Message-ID: <75DFF91B31A1284992092BDB70C92324035E611A@ftwp45ns.br-inc.net>

FYI... SUM function (for that matter any aggregate function except COUNT, G= ROUPING) ignore NULLs. Try this:

select sum(nvl(test,5)) from test

            8

select nvl(sum(test),5) from test;

            3

select nvl(sum(test),5) from test
where test is null;

            5

select sum(n) from test;

            3

-----Original Message-----

From: Juan Carlos Reyes Pacheco [mailto:jreyes_at_dazasoftware.com] Sent: Tuesday, June 22, 2004 12:21 PM
To: oracle-l_at_freelists.org
Subject: RE: Slow running Query.

Hi Lex, why you say that, could you showme why please

I show you why I say is the same:
 SQL> select * from test;

      TEST

---

         1

         2

Transcurrido: 00:00:00.00
SQL> select count(*) from test where test is null;

  COUNT(*)

---

         1

Transcurrido: 00:00:00.00
SQL> select sum(nvl(test,0)) from test;

SUM(NVL(TEST,0))

---

               3

Transcurrido: 00:00:00.00
SQL> select nvl(sum(test),0) from test;

NVL(SUM(TEST),0)

---

               3

Transcurrido: 00:00:00.00

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Received on Tue Jun 22 2004 - 12:39:39 CDT