Trigger that checks if value exists in another table before insert

Hi,
Can any one help me with the correct code.
I am trying to write a trigger that checks if the new value (:new.T1) does not exist in another table (T2) before entering it (in T1).
Create or replace trigger T1
BEFORE
insert on T1
for each row
Declare
x Number;
begin
SELECT Count (*) INTO x
From T2 WHERE T2.Col1 = :new.T1;
IF (x > 1 or x = 1) Then
DBMS_OUTPUT.PUT_LINE('This value has been used before try another one.');
END IF;
EXCEPTION
WHEN NO_DATA_FOUND THEN
INSERT INTO T2 (Col1) values (:new.T1);
WHEN TOO_MANY_ROWS THEN
DBMS_OUTPUT.PUT_LINE('This value has been used before try another one.');
end;

I think this question is suitable for the SQL and PL/SQL forum.

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