Hi Dan,
To be sure to collect something, you could use the "nvl(VALUE_ORI,
replacement_value_if_VALUE_ORI_is_null)" function which will return
something if the entry value is null otherwise return the entry value.
select nvl( max(id), 0 ) from table_id ;
The "nvl" is an Oracle function but sure that there is something similar on
Mysql
==================
SQL> create table table_id ( id integer );
Table created.
SQL> select max(id) from table_id;
MAX(ID)
----------
SQL> select nvl(max(id), 0) from table_id;
NVL(MAX(ID),0)
--------------
0
SQL> insert into table_id(id) values (1);
1 row created.
SQL> select nvl(max(id), 0) from table_id;
NVL(MAX(ID),0)
--------------
1
==================
Michel
-----Message d'origine-----
De: dan [mailto:[EMAIL PROTECTED]
Date: dimanche 26 octobre 2003 14:40
À: [EMAIL PROTECTED]
Objet: Re: RE : SQL Syntax quickie
The MAX(id) didn't return anything, i eventually settled for an idea posted
to
SELECT id FROM memodata ORDER BY id DESC
then take the first line value and ignore the rest. Ideally though i want
the last line with the highest id number. I know for a fact that another
INSERT won't happen before the SELECT because they happen immediately one
after the other.
FYI, i'm using MySQL and DBD::mysql if that's any more help.
Many thanks
Dan
"Tore Aursand" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> On Sun, 26 Oct 2003 06:30:11 +0100, SIMON Cedric wrote:
> > For your query, try "SELECT MAX(id) FROM table"
> > That works with mysql.
>
> That should "work" with most databases, but what happens if there's a new
> insert between the original insert and the SELECT statement above?
>
> This _could_ be solved by locking the table before the insert, and then
> unlocking it again after you've select the maximum id from the same table.
>
>
> --
> Tore Aursand <[EMAIL PROTECTED]>
>
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