Creating a trigger in Oracle Express

Question

I was trying to do something like auto-increment in Oracle 11g Express and SQL Developer. I know very little about Oracle and I am also new to triggers.

I tried run

Answer 1

This is how I have solved this problem, put "set define off;" before the command:

set define off;
create or replace trigger [...]
[...]
end;
/

Then highlight both commands and press F9 to run. Or you could run all the commands with F5.

It seems, that if the commands are executed separetly with F9, then the set define off does not take affect.