Oracle SQL trigger on update of column

Question

I\'m trying to create a trigger for my table which automatically adds a published date based on when a certain flag is set to \'Y\'

I don\'t have much experience wit

Answer 1

I don't know What version of Oracle do you use? In Oracle 10g I got the following error:

ORA-04084: cannot change NEW values for this trigger type
04084. 00000 -  "cannot change NEW values for this trigger type"
*Cause:    New trigger variables can only be changed in before row
           insert or update triggers.
*Action:   Change the trigger type or remove the variable reference.

It does not allow to change the field on AFTER triggers.