Como inserir pdf e vídeo separadamente com campo de tabela diferente em php

    <?php
    if(isset($_POST['submit']))
    {
    $allowedExts = array("pdf");
    $temp = explode(".", $_FILES["file"]["name"]);
    $extension = end($temp);
    if ((($_FILES["file"]["type"] == "application/pdf")
    && ($_FILES["file"]["size"] < 20000)
    && in_array($extension, $allowedExts))
      {
      if ($_FILES["file"]["error"] > 0)
        {
        echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
        }
      else
        {
        echo "Upload: " . $_FILES["file"]["name"] . "<br>";
        echo "Type: " . $_FILES["file"]["type"] . "<br>";
        echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
        echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br>";
       if (file_exists("upload/" . $_FILES["file"]["name"]))
          {
          echo $_FILES["file"]["name"] . " already exists. ";
          }
        else
          {
          move_uploaded_file($_FILES["file"]["tmp_name"],
          "upload/" . $_FILES["file"]["name"]);
          echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
          }
        }
      }
    else
      {
      echo "Invalid file";
      }$query="insert into detail(detail_id,topic_id,detail) values('$detail_id','$topic_id','$detail')";

$q=mysql_query($query);
    if($q)
{
//echo "save successfully";
$_SESSION['msg']="Save Successfully.... Thank you";


}
else
{
//echo "try again..";
$_SESSION['msg']="Try again..";

}
}

?>