Creation of sequence and trigger for each table!!!!!!!1

Question

Hi
I am new to trigger and Sequence field. In one of my database we have many tables with fields for specifing ID numbers. Iam planning to insert the ID field with help of a Sequence and trigger...that trigger fires by adding the sequence value from the dual table. Now the point is here we r having around *60* table with ID field. And i am planning use the above process for each table by creating sequences and trigger for each table.
Will this affects the performance of database.
Is there any other option other than the above process, I mean other than creating sequences and trigger for each table.
PLzz help to resolve this issuee......
Shiyas
Edited by: user13170361 on Jun 7, 2010 12:37 AM

Answer 1

Tiger, I didn't mind about your comment, but the point is try to use
select NVL(max(a) + 1,1) into i from p1_temp;This line in your trigger code and see what is happening. The problem is with your trigger. You are using group by function and you will not get no_data_found !
For more help, this is some modification of your code.
SQL> create table p1_temp (a number(10) primary key, b number(10));
Table created.
SQL> create or replace trigger trg_p1_temp
  2  before insert on p1_temp for each row
  3  declare
  4  i number(10);
  5  begin
  6  begin
  7  select NVL(max(a) + 1,1) into i from p1_temp;
  8  exception
  9  when no_data_found then
10  i := 1;
11  end;
12  :new.a := i;
13  end;
14  /
Trigger created.
SQL> insert into p1_temp(b) values (1);
1 row created.
SQL> insert into p1_temp(b) values (2);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from p1_temp;
         A          B
         1          1
         2          2
SQL> Edited by: Saubhik on Jun 7, 2010 2:30 AM