Inner Join paste

<html>
<head>
<title>Results</title>
</head>
<body>
<style>
body {background-image: url("margarita cookies.jpg")}
h1, p {text-align: center}
table, th, td {
     border: 1px solid black;
     background-color:#e6ffcc;
     padding: 10px;
}
</style>

<body>
<h1>Poisons</h1>
<?php
$host="localhost";
$username="alcohaul";
$password="drunk";
$database="alcohaul";
$link= mysqli_connect($host,$username,$password,$database);
$type = $_GET['type'];
$hh = $_GET['happy_hour'];
$flavor = $_GET['flavor'];
$area = $_GET['area'];
$rest = $_GET['rest'];

$master = "SELECT master.master_id, rest.rest, marg.marg, area.area, flavor.flavor, type.type, happy_hour.hh FROM master";

if (isset($_GET['type']) && ($_GET['type']!== 'No preference')){
   $master.=" INNER JOIN type on master.type_id=$type";
}
if (isset($_GET['happy_hour']) && ($_GET['happy_hour'] !=='No preference')){
    $master.=" INNER JOIN happy_hour on master.hh_id=$hh";
}
if (isset($_GET['flavor']) && ($_GET['flavor'] !=='No preference')){
   $master.=" INNER JOIN flavor ON master.flavor_id=$flavor";
}
if (isset($_GET['area']) && ($_GET['area'] !=='No preference')){
   $master.=" INNER JOIN area ON master.area_id=$area";
}
if (isset($_GET['rest']) && ($_GET['rest'] !=='No preference')){
   $master.=" INNER JOIN rest ON master.rest_id=$rest";
}
$master.=" ORDER BY rest.rest, marg.marg";
$result = $link->query($master);

if ($result->num_rows > 0) {
    echo "<table align=center><tr><th>Restaurant</th><th>Margarita Name</th><th>Area of Austin</th><th>Flavor</th><th>Consistency</th><th>Happy Hour?</th></tr>";
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "<tr><td>".$row["rest"]."</td><td>".$row["marg"]."</td><td>".$row["area"]."</td><td>".$row["flavor"]."</td><td>".$row["type"]."</td><td>".$row["hh"]."</td></tr>";
    }
    echo "</table>";
} else {
    echo "<h2>0 results. Stop being picky, all alcohol is good alcohol!</h2>";
}
$conn->close();

mysqli_close($link);
?>

</body>
</html>