Hi,

>Is there a way, in a Before update trigger, to know the name of the
>column updated?

No.

you have to ask using something like (for each column you want to test):

if (new.column1 is distinct from old.column1) then {... if true, column1 was
modified ...}

>eg: I have a table with 6 columns , and a Before update trigger on this
>table in order to add the Today date in the column 6.
> But I don't want the trigger add a date to the column 6 if the column 2
>is updated. Is it possible?

something like:

if (new.column2 is not distinct from old.column2) then
new.column6 = current_date;


Regards,
Anderson Farias