How to call or not call a Trigger in same table based on condition?

Question

Hi
How to call or not call a Trigger in below situations..
If a table contains a record of same value i.e,
[i[u]]ID
1
1
3
In above ID 1 is repeated for two times.
In this situations i don't want to call a trigger..
But, the value ID is for 3, now i want to fire a trigger.
Based on this i want to delete in another table.
How can I check it?
Thanks

Answer 1

Thanks for ur reply..
The below is my scnario..
I am having two table
employee
Id empcol
101 111
101 222
102 444
Department
id deptcol
101 457
101 678
102 543
The above is my table structure no one column is PK, so i m not able create FK.
When I am deleting from employee where id =101 and empcol=111,
the above record is deleted.
At present I am using After Update Trigger..
So trigger is called and delete the id 101 in Department table.
In my scenario i can't delete a record in Department table
bcoz i am having id morethan 101 in employee table.
If employee table contains one ID like 102 the Trigger should works.
How can I check the condition After delete on employee table it contains morethan same employee id?
The below is my Trigger..
CREATE OR REPLACE TRIGGER CALL_TRIGGER
AFTER DELETE ON Employee
FOR EACH ROW
DECLARE
count_id pls_integer;
BEGIN
SELECT COUNT(*) INTO count_id from Employee WHERE ID <>:new.ID;
IF( count_id >1) THEN
DELETE FROM Depratment where ID=:old.ID;
END IF;
END;
I am geting an error ORA-04091 table is mutuating, trigger cannot seen it.
I had tried with package and package body also.. But no luck.
Thanks