RE: Slow running Query.
- From: "Lex de Haan" <lex.de.haan@xxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 22 Jun 2004 19:33:02 +0200
Juan,
in your case you don't even need the nvl function -- because the result is
always 3.
the problem occurs with the empty set. check this out:
SQL> create table blah(c1 number);
Table created.
SQL> select nvl(sum(c1),0), sum(nvl(c1,0)) from blah;
NVL(SUM(C1),0) SUM(NVL(C1,0))
-------------- --------------
0
SQL>
Kind regards,
Lex.
---------------------------------------------
visit my website at http://www.naturaljoin.nl <http://www.naturaljoin.nl>
---------------------------------------------
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Juan Carlos Reyes
Pacheco
Sent: Tuesday, June 22, 2004 18:21
To: oracle-l@xxxxxxxxxxxxx
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
-------Original Message-------
From: oracle-l@xxxxxxxxxxxxx
Date: 06/22/04 12:43:39
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: Slow running Query.
Juan,
unfortunately sum(nvl(column,0)) is not equivalent to nvl(sum(column),0)..
Kind regards,
Lex.
---------------------------------------------
visit my website at http://www.naturaljoin.nl
---------------------------------------------
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Juan Carlos Reyes
Pacheco
Sent: Tuesday, June 22, 2004 17:15
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: Slow running Query.
Hi, I will do t he following
Try creating function indexes on composed columns you are queryin and tellme
if this improves something
For example you are using as_date in the where column, but you don't have a
index on substr(ca_date,1,4,....
Only to avoid unncesary plsql work
1. instead sum(nvl(column,0)) I'll use nvl(sum(column),0
2. instead of decode use case
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