That's really cool
Thanks
siomara
>From: "Eric Fitzgerald" <[EMAIL PROTECTED]>
>To: "Siomara Pantarotto" <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>
>Subject: Re: count(*) on different tables
>Date: Mon, 21 May 2001 14:08:00 -0700
>
>Well, let's do a test:
>
>mysql> CREATE TABLE testcount (product INT NOT NULL AUTO_INCREMENT PRIMARY
>KEY, description VARCHAR(50));
>Query OK, 0 rows affected (0.00 sec)
>
>**Ran perl script here to populate the table**
>mysql> SELECT * FROM testcount LIMIT 10;
>+---------+---------------+
>| product | description |
>+---------+---------------+
>| 1 | Decription 1 |
>| 2 | Decription 2 |
>| 3 | Decription 3 |
>| 4 | Decription 4 |
>| 5 | Decription 5 |
>| 6 | Decription 6 |
>| 7 | Decription 7 |
>| 8 | Decription 8 |
>| 9 | Decription 9 |
>| 10 | Decription 10 |
>+---------+---------------+
>10 rows in set (0.03 sec)
>
>mysql> SELECT COUNT(*) FROM testcount;
>+----------+
>| COUNT(*) |
>+----------+
>| 100000 |
>+----------+
>1 row in set (0.00 sec)
>
>mysql> SELECT COUNT(1) FROM testcount;
>+----------+
>| COUNT(1) |
>+----------+
>| 100000 |
>+----------+
>1 row in set (0.00 sec)
>
>mysql> SELECT COUNT(2) FROM testcount;
>+----------+
>| COUNT(2) |
>+----------+
>| 100000 |
>+----------+
>1 row in set (0.00 sec)
>
>mysql> SELECT COUNT(*) FROM testcount WHERE product > 10;
>+----------+
>| COUNT(*) |
>+----------+
>| 99990 |
>+----------+
>1 row in set (0.32 sec)
>
>mysql> SELECT COUNT(1) FROM testcount WHERE product > 10;
>+----------+
>| COUNT(1) |
>+----------+
>| 99990 |
>+----------+
>1 row in set (0.32 sec)
>
>mysql>
>
>
>As you can see, it really makes no difference to MySQL.
>
>----- Original Message -----
>From: "Siomara Pantarotto" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
>Sent: Monday, May 21, 2001 1:48 PM
>Subject: Re: count(*) on different tables
>
>
> > Cool .... but how about if you put a where clause to your select??
> >
> > SQL> select count(1) from product where productid >3;
> >
> > COUNT(1)
> > ----------
> > 7
> >
> > Would count(*) show the same performance as count(1)???
> >
> > Siomara
> >
> >
> > >From: "Eric Fitzgerald" <[EMAIL PROTECTED]>
> > >To: "Siomara Pantarotto" <[EMAIL PROTECTED]>,
><[EMAIL PROTECTED]>
> > >Subject: Re: count(*) on different tables
> > >Date: Mon, 21 May 2001 13:11:38 -0700
> > >
> > >Actually, as far as performance goes, it depends on table types. Most
>of
> > >the MySQL table handlers keep an internal count of record numbers.
>Thus,
>a
> > >select count(*) from table; is as fast as it gets.
> > >
> > >----- Original Message -----
> > >From: "Siomara Pantarotto" <[EMAIL PROTECTED]>
> > >To: <[EMAIL PROTECTED]>
> > >Sent: Monday, May 21, 2001 12:26 PM
> > >Subject: Re: count(*) on different tables
> > >
> > >
> > > > Well ...
> > > >
> > > > I don't know enough about mysql but it must allow you somehow to
>specify
> > >the
> > > > column by number as in Oracle and other DBs
> > > >
> > > > SQL> select count(*) from product;
> > > >
> > > > COUNT(*)
> > > > ----------
> > > > 10
> > > >
> > > > SQL> select count(1) from product;
> > > >
> > > > COUNT(1)
> > > > ----------
> > > > 10
> > > >
> > > > Once you just want to count the rows the performance of your select
>will
> > >be
> > > > much better if you specify a column rather than *.
> > > >
> > > > Siomara
> > > >
> > > >
> > > > >From: "Ansgar Becker" <[EMAIL PROTECTED]>
> > > > >To: <[EMAIL PROTECTED]>
> > > > >Subject: count(*) on different tables
> > > > >Date: Mon, 21 May 2001 20:18:35 +0200
> > > > >
> > > > >Hi,
> > > > >
> > > > >is it possible to get *one* quick result with the rowcount of each
> > >table
> > >in
> > > > >one database, without knowing the column-names?
> > > > >
> > > > >this does *not* work:
> > > > > select count(t1.*), count(t2.*)
> > > > > from table1 t1, table2 t2
> > > > >
> > > > >Manual doesn't say anything about that.
> > > > >
> > > > >Greetings,
> > > > >Ansgar Becker
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> >---------------------------------------------------------------------
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