# RE: Difference between count(1) and count(*)

• From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
• To: <oracle-l@xxxxxxxxxxxxx>
• Date: Thu, 8 Jul 2004 10:36:31 -0400
```Who needs count(*) or count(anything)?

Try this:
select -1/2+1/2*sqrt(1+8*sum(rownum)) from wi_cumulative;
;-)

Harakiri.)

-Mark

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
Sent: Thursday, July 08, 2004 10:32 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: Difference between count(1) and count(*)

On 07/08/2004 09:40:17 AM, Peter Miller wrote:
> 1,749,951 rows returned in every case
>=20
> count(rowid) - approx 3.2 secs
> count(obj#)  - approx 3.5 secs
> count(1)     - approx 3.6 secs
> count(*)     - approx 3.6 secs
> count(rownum)- approx 4.6 secs
> count(source)- approx 8.6 secs
>=20

Connected to:
Oracle9i Enterprise Edition Release 9.2.0.5.0 - Production
With the Partitioning option
JServer Release 9.2.0.5.0 - Production
=20
SQL> set timing on
SQL> select count(*) from wi_cumulative;
=20
COUNT(*)
----------
12148659
=20
Elapsed: 00:00:20.16
SQL> select count(rowid)  from wi_cumulative;
=20
COUNT(ROWID)
------------
12148659
=20
Elapsed: 00:00:20.62
SQL> select count(1)  from wi_cumulative;
=20
COUNT(1)
----------
12148659
=20
Elapsed: 00:00:21.52
SQL> select count(null) from wi_cumulative;
=20
COUNT(NULL)
-----------
0
=20
Elapsed: 00:00:19.12
SQL>

Tanel's favorite way of counting differed from the real count for only =
and it wasn't that much faster, so the difference doesn't justify lack =
of precision.
--=20
Oracle DBA

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