How to execute a same sequence number for the resulting dynamic rows

Question

Hi friends,
I have a sequence and trigger(which will fire id for each and every row insert).
My scenario is, If i update more than 5 rows at a time means, i need to set a same sequence number example(1) for all the 5 rows.
Next time, if i update another 5 rows means, then i need to set a same sequence number (i.e) 2 for the next 5 rows.
So, my updation will be dynamic(may be 2 ,5, 10 rows at a time), But i need to set a same sequence number for one of the column for all the rows that i update.
Next time, if i update another set of rows means, then i need to set only the next sequence number(i.e) 2(assume that previously updated sequence for the before set of rows is 1) for another set of rows.
Like that sequence has to update in a sequential manner for more than one set of rows in that column.
How to achieve it friends.
example
id-----------------name
1-------------------A
1-------------------B
1-------------------C
1-------------------D
1-------------------E
2-------------------D
2-------------------E
2-------------------F
2-------------------G
3-------------------H
3-------------------IBrgds,
Mini

Answer 1

Hi,
You forgot to mention your version.
If you want a trigger based solution, then in 10g you need two triggers
1. A statement level trigger that takes sequence.nextval into a dummy variable that will not be used.
2. A for each row trigger that uses sequence.currval.
In 11g you should be able to write a single, composite trigger.
If you want a solution with no triggers, it could look something like
SQL> create sequence s start with 10;
Sequence created.
SQL>
SQL> create or replace function s_wrapped
  2  return number
  3  as
  4     v number;
  5  begin
  6     select s.nextval
  7     into v
  8     from dual;
  9
10     return v;
11  end s_wrapped;
12  /
Function created.
SQL> create table tab1 as (Select level x, cast(null as number) y from dual connect by level <= 5);
Table created.
SQL> update tab1
  2    set y = (select s_wrapped from dual)
  3   where x <= 3;
3 rows updated.
SQL> commit
  2  /
Commit complete.
SQL> select *from tab1
  2  /
       X          Y
       1         10
       2         10
       3         10
       4
       5
SQL>Regards
Peter