IF/ELSE condition in sql and php -

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i'm inserting database id , hours, working successfully. when insert new value id has previous value, old val isn't replaced new, instead they're kept both. i'm trying update function if/else statement (commented part). still same result. if/else statement must check first if hours (a column in table) value empty, if perform sql insert, else perform sql update. please?

if (isset($_post['submit'])) {     $hours = $_post['hours'];     $selectid = $_post['selectid'];     $sql1 = "insert `editedworkhours` (`id`,`h`) values('$selectid','$hours')";      $getresult = mysql_query($sql1);     if (mysql_affected_rows() > 0) {      } else {      }      $tempname = $row['field'];     $sql2 = "update editedworkhours set h ='" . $_get["hours"] . "' idnumber='" . $_get["selectid"] . "'";     $result2 = mysqli_query($con, $sql2);     if ($con->query($sql2) === true) {     } else {      }   } echo $menu;

try this

<?php     if(isset($_post['submit']))     {         $addedhours = $_post['addedhours'];         $selectaf = $_post['selectaf'];          $sql1="select * editedworkhours afnumber='$selectaf' , addedwh ='$addedhours'";          $getresult = mysql_query($sql1);         $count = count($getresult);         if(!empty($count) || $count==1)         {             $tempname = $row['field'];             $sql2 = "update editedworkhours set addedwh ='$addedhours' afnumber='$selectaf'";             $result2 = mysql_query($sql2);              if (isset($result2))             {                 //data inserted             }             else             {                 //insert failed                 echo '<script>swal("error", "something went wrong error");</script>';             }             echo '<script>swal("success", "changes have been saved", "success");</script>';         }         else         {             $sql3 = "insert editedworkhours (afnumber,addedwh) values('$selectaf','$addedhours')";             $result =   mysql_query($sql3);             if(isset($result))             {                 echo 'success';             }             else             {                 echo 'failed';             }         }     }     echo $menu;

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