In MySQL versions before 5.0, you can write a user-defined function in C and compile it as a shared object. Beginning with MySQL 5.0, you can write stored routines. See these sections of the MySQL Manual:

http://dev.mysql.com/doc/mysql/en/Adding_functions.html
http://dev.mysql.com/doc/mysql/en/Adding_procedures.html

> Date: Sat, 30 Oct 2004 23:13:42 +0200
> To: <[EMAIL PROTECTED]>
> From: "Ferhat BINGOL" <[EMAIL PROTECTED]>
> Subject: MySQL functions
> Message-ID: <[EMAIL PROTECTED]>
>
> Hi,
>
> How do I add a new function to MySQL SQL statement list.
>
> What I mean is AVG(), MIN() or MAX() is a ready function isnt it? Is there a
> way to add new functions without compiling all server?
>
> Regards...




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