Store procedure help please

Question

Oracle Stored procedure query..
I have 1 table with below schema.
ID empID clsID Year Cuser CDatetime
Sample Data:
ID     EMPID     ClsID     Year     Cuser     CDateTime
1     100     2     2000     John     1/1/2000
2     100     3     2000     John     1/1/2000
3     100     4     2000     John     1/1/2000
4     100     5     2000     John     1/1/2000
5     100     6     2000     John     1/1/2000
6     100     7     2000     John     1/1/2000
7     100     8     2001     John     1/1/2000
8     100     2     2001     John     1/1/2000
9     100     3     2001     John     1/1/2000
10     101     9     2000     John     1/1/2000
I need to write a stored procedure which will copy the data from Year 2000 to year 2001. So I can reuse data from yr 2000 to yr 2001.
Conditions:
1. Copy data from 2000 to 2001.
2. If 2001 already has some data, leave those data alone.
3. No duplicate data from 2000 to 2001.
Using cursor variable what is the stored procedure will do the same. I need the stored procedure code, Thanks in advance.

Answer 1

here are some basic query. i'll leave to you the creation of procedure so that you have something work on.
  select [sequence id e.g. sequence_id.nextval],
         empid,
         cisid,
         year,
         cuser,
         cdatetime
    from [table name]
   where (empod,cisid,year,cuser,cdatetime) not in (select empod,cisid,year,cuser,cdatetime
                                                       from table)