Re: Difference between count(1) and count(*)

From: Tanel Põder <tanel.poder.003_at_mail.ee>
Date: Thu, 8 Jul 2004 11:38:01 +0300
Message-ID: <016901c464c6$e1250b20$bff923d5@porgand>

I've actually seen an "expert" optimizing the count() statement, by using count(null) "since null means nothing and thus is the fastest" :)

But check this:

SQL> select count(*) from dual;

COUNT(*)

SQL> select count(null) from dual;

COUNT(NULL)

Tanel.

Original Message ----- From: "Jeremiah Wilton" <jwilton_at_speakeasy.net> To: <oracle-l_at_freelists.org> Sent: Thursday, July 08, 2004 9:31 AM Subject: Re: Difference between count(1) and count(*)

> > On Thu, 8 Jul 2004 11:27:28 +0530 oracle-l_at_freelists.org wrote:
> > > Can you let me know the difference between count(*) and count(1) ?
> >
> > count(1) is supposed to be more efficient and faster.
>
> Oh boy, here we go.
>
> --
> Jeremiah Wilton
> http://www.speakeasy.net/~jwilton
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Received on Thu Jul 08 2004 - 03:36:14 CDT