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<?php

$username = 'root';
$password = '';
$db = 'test';

$conn = new mysqli ('localhost',$username, $password, $db) or die("unable to connect");

$query="insert into pracownicy (dzial,idprac,Nazwisko,Placa,zespol) values ('IT','15','czlowiek','50000000','Helpdesk')";
if($query)
    echo 'data inserted<br>';
$result = mysqli_query($conn, "SELECT * FROM `pracownicy`");

// using while loop to dispaly data from database
while($row = mysqli_fetch_array($result))
  {

    echo "$row[0] - $row[1] - $row[2] - $row[3] - $row[4]<br>";

  }

// free your result
  mysqli_free_result($result);

  mysqli_close($conn);

?>