Picking unique records from huge set of records

Hi db experts,
Could anyone help me in having a query which is based on partitioned table with 400,00,000 records each day . It has member number unique and I want to pick unique ones say for dates between 20-jan-2007 and 20-apr-2007.
How can I proceed to write query. Am expecting query which will only pull unique records in less possible time.
Thanks in advance
Ravikanth

The table has 400 lakh records each day my mistake - I misread the original post.
Is this a one-off exercise or an ongoing requirement? What are you going to do with the data once you've got it - do you need more columns than the numbers? Do you have a feel for how many unique numbers there are per day and over the entire quarter?
The easiest way to do this would probably be to create an extract table (maybe a temporary one) and vary the query I posted to insert the unique numbers into this table for each day i.e. run it multiple times against a smaller data set. Then you can select the unique numbers from the extract table to get the finished set.
Of course, whether this is a viable solution depends on the answers to the questions I posed above. The more information you give us the easier it is for us to advise you.
Cheers, APC

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      DBConnection conn = new DBConnection();
      CallableStatement cstmt = conn.prepareCall("begin " + PACKAGE + "Get_Consultant_Cursors(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?);end;");
      ResultSet rsConsultant;
      ResultSet rsEmployee;
      Consultant curConsult;
      Employee curEmployee;
      try
         if(cstmt!=null)
            String Consult_Type = null;
            if ("true".equalsIgnoreCase(display_Branch) ||
                 "true".equalsIgnoreCase(display_Employee)){
               Consult_Type = null;
            else {
               Consult_Type = "MAIN";
            cstmt.setString("pvConsultant_Firm", pvConsultant_Firm);
            cstmt.setString("pvOffice_Type", Consult_Type);
            cstmt.setString("pvAddr_City_Main", pvAddr_City_Main);
            cstmt.setString("pvAddr_State_Main", pvAddr_State_Main);
            cstmt.setString("pvAddr_Zip_Main", pvAddr_Zip_Main);
            cstmt.setString("pvAddr_City_Branch", pvAddr_City_Branch);
            cstmt.setString("pvAddr_State_Branch", pvAddr_State_Branch);
            cstmt.setString("pvAddr_Zip_Branch", pvAddr_Zip_Branch);
            cstmt.setString("pvResidency", pvResidency);
            cstmt.setString("pvFirst_Name", pvFirst_Name);
            cstmt.setString("pvLast_Name", pvLast_Name);
            cstmt.setString("pvOrder_By_Employee", pvOrder_By_Employee);
            cstmt.setString("pvOrder_By_Office", pvOrder_By_Office);
            cstmt.registerOutParameter("pcurConsultant_Office", OracleTypes.CURSOR);
            cstmt.registerOutParameter("pcurConsultant_Employee", OracleTypes.CURSOR);
            cstmt.execute();
            rsConsultant = (ResultSet)cstmt.getObject("pcurConsultant_Office");
            rsEmployee = (ResultSet)cstmt.getObject("pcurConsultant_Employee");
            while(rsConsultant.next())
                curConsult = getConsultant(rsConsultant);
                retval.add(curConsult);
                 if ("true".equalsIgnoreCase(display_Employee)){
HOW DO I HANDLE THIS?
             rsConsultant.close();
             conn.closeCstmt(cstmt);
          catch (SQLException e)
             conn.logToFile(this, "getConsultants()", e);
          conn.close();
       return (Consultant[])retval.toArray(new Consultant[retval.size()]);
    }

It will basically look something like this:
Consultant A           Main Office
                                             Employee 1
                                             Employee 2
                                             Employee 3
                       Branch A
                                             Employee 4
                                             Employee 5
                       Branch B
                                             Employee 6
                                             Employee 7
Consultant B           Main Office
                                             Employee 8
                                             Employee 9
                       Branch A
                                             Employee 10
                                             Employee 11The consultant and branch offices are in one result set and the employees are in another. I need to combine them
so I can return them and display them as above in my JSP.

Picking unique records from huge set of records

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