sada

<?php
$con=mysqli_connect("localhost","root","","aaaa");
// Check connection
if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }

// Perform a query, check for error
//if (!mysqli_query($con,"INSERT INTO SALA (NUMER,PIETRO) VALUES ('12',123), (123,123)"))
//  {
//  echo("Error description: " . mysqli_error($con));
//  }
$pyt = mysqli_query($con, "SELECT s.ID_SALI, s.NUMER, o.ID_UZYT, o.IMIE, o.NAZWISKO FROM sala s,uzytkownik u,jest_opiekunem op WHERE op.ID_SAL=s.ID_SALI AND op.ID_US=u.ID_UZYT");

echo "<table>";
echo "<tr><th>ID_SALI</th><th>NUMER SALI</th><th>ID_USER</th><th>IMIE</th><th>NAZWISKO</th></tr>";

while ($tabl = mysqli_fetch_assoc($pyt)) {
echo "<tr><td>{$tabl['ID_SALI']}</td><td>{$tabl['NUMER']}</td><td>{$tabl['ID_USER']}</td><td>{$tabl['IMIE']}</td><td>{$tabl['NAZWISKO']}</td></tr>";
}
echo "</table>";

mysqli_close($con);
?>