Código PHP:
                         for(dia=1;dia<=31;dia++,j++){
 
                          String fechaCompleta = year+"/"+mes+"/"+dia;
                          System.out.println("BIEN");
                          query2 = "Select fkxc,valork,valorc,valord, Max(greatest(hora0430_0530,hora0530_0630,hora0630_0730,hora0730_0830,"+
                                   "hora0830_0930,hora0930_1030,hora1030_1130,hora1130_1230,"+
                                   "hora1230_1330,hora1330_1430,hora1430_1530,hora1530_1630,"+
                                   "hora1630_1730,hora1730_1830,hora1830_1930)) As ValorMax FROM "+" "+elemento+ " WHERE fecha= ? and estacion= ? group by fkxc,valork,valorc,valord";
 
                          pst =  prepararConsulta(query2);
                          pst.setString(1, fechaCompleta);
                          pst.setString(2, estacion);
                          
                          rst = pst.executeQuery();
                          
                          rst.next();                          
 
                          fkxc   = rst.getDouble("fkxc");
                          valork = rst.getInt("valork");
                          valorc = rst.getDouble("valorc");
                          valord = rst.getDouble("valord");
                          cad    = rst.getDouble("ValorMax");
 
 
                                System.out.println(cad);
                                System.out.println(fkxc);
                                System.out.println("C:"+valorc);
                                System.out.println("D:"+valord);
                                System.out.println("K:"+valork);
                                System.out.println(fechaCompleta);
                                System.out.println(estacion);
 
 
                          
                          tablaDiarios.setValueAt(fkxc, i, 3);
                          tablaDiarios.setValueAt(valork, i, 4);
                          tablaDiarios.setValueAt(valorc, i, 5);
                          tablaDiarios.setValueAt(valord, i, 6);
                          tablaDiarios.setValueAt(cad, i, j); 
    
 


