Comapring Records in ResultSet ,Issue of Performance

Question

Hi,
i got a Table on which I am calling select ,and getting the resultset as in which some of the rows will Have first column value as same ,but subsequent columns may have data or null Values.I want to club all the values for same First Column Value.I did it like that in java,but is it cab done in Oracle Procedures it self.
Any analysis of this code and Database Loops ideas would be helpful.
esultSetMetaData rsd = Rs2.getMetaData();
int n = rsd.getColumnCount();
Vector val = new Vector(n);
Vector val2 = new Vector(n);
System.out.println("No Of Columns--"+n);
while(Rs2.next())
     if(Rs2.isFirst())
          for(int l=1;l<=n;l++)
          val.add(l-1,(Object)Rs2.getString(l));
     else
               for(int j=1;j<=n;j++)
          val2.add(j-1,(Object)Rs2.getString(j));
               if(val2.get(0).toString().equals(val.get(0).toString()))
                         System.out.println("same orderheaderid"+val2.get(0).toString());
                         i--;
                         for(int k=1;k<=n;k++)
                         if(val.get(k-1)==null)
                              if(val2.get(k-1)!=null)
                              val.set(k-1,val2.get(k-1));
                         val2.clear();
                         if(Rs2.isLast())
                              for(int l=1;l<=n;l++)
                                   System.out.println(val.get(l-1));
                         else
                    else
               {          System.out.println("different if"+val.get(0));
                         for(int f=1;f<=n;f++)
                              System.out.println(f-1+"------"+val.get(f-1));
                    System.out.println("Count Value is--"+i);
                    val.clear();
                    val =(Vector)val2.clone();
                    if(Rs2.isLast())
                         for(int r=1;r<=n;r++)
                              System.out.println(val2.get(r-1));
                    else
                         for(int s=1;s<n;s++)
                              val.set(s-1,val2.get(s-1));
                    val2.clear();
                    val2 = (Vector)val.clone();
          }i++;
          //z++;
Rs2.close();
Thank u
Vasu

Answer 1

Double post:
http://forum.java.sun.com/thread.jsp?forum=48&thread=544516&tstart=0&trange=15
http://forum.java.sun.com/thread.jsp?forum=48&thread=544517&tstart=0&trange=15
Sounds like it breaks the rules for first normal form to me:
http://databases.about.com/library/weekly/aa081901a.htm