how to get values from one excel database that do not match with the values in other database in java?

I have two excel databases. first one is database:

Sl_no   Species         State       District        Local_equation                  General_equation    Specific_gravity
1       Cassia fistula  Uttrakhand  Haldwani        0.16019-2.81861*D+16.9328*D*D   (-0.046597*H)^1/2   0.74
2       Shorea robusta  Uttrakhand  Almora           (-0.046597+2.227173*D)^1/2     (-0.046597*D)^1/2   0.48

and second one is Field_Data_1 and it contains two sheets: Plot and Data this is Plot sheet:

Plot_ID Latitude Longitude Altitude Location District State PlotSize_ha Date P1 37.6 40.6 640 Barkot RF, South from flux tower Dehradun Uttrakhand 0.1 31.05.2014

this is data sheet:

Plot_ID Sl_no   Species         Gbh_cm  Height
P1        1     Cassia fistula    13       1
P1        2     Shorea robusta    206      7

Using select query I want to display the names of those species whose district and state does not match with the second and third one.I dont have any idea which qquery to use. I have done this much till now.

if(selected1.contains(tmp1))
        {

                sql10 = "select * from [Plot$],[Data$] where [Data$].Plot_ID = ? ";
                pst10=con.prepareStatement(sql10);
                pst10.setString(1, tmp1);
                rs14=pst10.executeQuery();

                while(rs9.next() && rs14.next())
                {
                    HSSFRow row=sheet.createRow((short)i); 
                    st=rs14.getString("State");
                    dis=rs14.getString("District");
                    sp=rs9.getString("Species");

                    sql11="select * from [database$] where State = ?  and District = ? and Species = ?";
                    pst11=con1.prepareStatement(sql11); 
                    pst11.setString(1, st);
                    pst11.setString(2, dis);
                    pst11.setString(3, sp);
                    rs15=pst11.executeQuery();

                    //if(rs15.next())
                    //{    
                        while(rs15.next())
                        {
                            System.out.println(sp);
                            gbh=rs9.getDouble("Gbh_cm");
                            gbh1=RoundTo2Decimals(gbh);
                            gbhm=gbh/100.0;
                            gbhm1=RoundTo2Decimals(gbhm);
                            diameter=gbh/3.14;
                            diameter1=RoundTo2Decimals(diameter);
                            diameterm=diameter/100.0;
                            diameterm1=RoundTo2Decimals(diameterm);

                            System.out.print(gbh1+" ");
                            System.out.println(diameter1);

                            exp2=rs15.getString("Local_equation");
                            System.out.println(exp2);

                            //System.out.println(exp2);
                            String ss=Double.toString(diameterm1);
                            String regex="D";
                            String strrep=exp2.replaceAll(regex,ss);
                            System.out.println(strrep);
                            d2=eval(strrep);
                            d21=RoundTo2Decimals(d2);
                            System.out.println("Volume is:"+d21);
                            sg=rs15.getDouble("Specific_gravity");
                            System.out.println(sg);
                            biomass=d21*sg;
                            biomass1=RoundTo2Decimals(biomass);
                        }
                    //}
                        if(!rs15.next())
                        {
                            JOptionPane.showMessageDialog(this,"Match not found");
}