<?php
$servername = "localhost";
$username = "root";
$password = "pass";
$dbname = "SchoolBooking";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
?>
//usually have connect info in different file

<?php

Include('../connect.php');

$sql = "SELECT password ................sql stuff";
$result = $conn->query($sql);

if($result->num_rows > 0){
    while($row = $result->fetch_assoc()){
        echo $row["password"]; #field name
    }
}else{
 #no results
}
?>