Trigger to copy records from one table to another; ORA-04091:

Hello,
I'm trying to create a trigger that will move data from one table to another.
I have two tables (Trial1, Trial2) Both of them contains the same attributes (code, c_index)
I want to move each new record inserted in (code in Trial1) to (code in Trial2)
This is my trigger:
Create or replace trigger trg_move_to_trial2
After insert on Trial1
for each row
begin
insert into Trial2 (code)
select :new.code from Trial1;
end;It compiled, but when I insert new (code) record into (Trial1) it display this error:
Error report:
SQL Error: ORA-04091: table STU101.TRIAL1 is mutating, trigger/function may not see it
ORA-06512: at "STU101.TRG_MOVE_TO_TRIAL2", line 3
ORA-04088: error during execution of trigger 'STU101.TRG_MOVE_TO_TRIAL2'
04091. 00000 - "table %s.%s is mutating, trigger/function may not see it"
*Cause: A trigger (or a user defined plsql function that is referenced in
this statement) attempted to look at (or modify) a table that was
in the middle of being modified by the statement which fired it.
*Action: Rewrite the trigger (or function) so it does not read that table.I know what does this error mean, but I don't how to fix the error.
I tried to change the (After insert on Trial1) to be (Before insert on Trial1); that worked, but not in the right way. When I insert new value into (code in Trial1) and refreshed Trial2 table, as much as records I have in Trial 2 they will be duplicated. E.g.
Trial2
code
111
222
333when I insert in Trial1
Trial1
code
444
Trial2 will be:
code
111
222
333
444
444
444Can you please tell me how to solve this issue?
Regards,
Edited by: 1002059 on Apr 23, 2013 5:36 PM

You should not select from Trial1 - you have the data already. Just insert that value.
Create or replace trigger trg_move_to_trial2
After insert on Trial1
for each row
begin
insert into Trial2 (code)
values (:new.code);
end; regards,
David

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