> Just to assure me....
>
> In a trigger that is defined as BEFORE UPDATE can I use
>
> OLD.SomeValue<>NEW.SomeValue
>
>
> Or can I only use this in a trigger defined as AFTER UPDATE ?

In both, actually.

But NEW.<column> = <new value> can only be used in a BEFORE
trigger.

With regards,

Martijn Tonies
Database Workbench - developer tool for InterBase, Firebird, MySQL & MS SQL
Server
Upscene Productions
http://www.upscene.com