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Q12.php
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Q12.php
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<!DOCTYPE html>
<html>
<head>
<title>Q12</title>
<link rel="stylesheet" type="text/css" href="styles_Q.css">
</head>
<body>
<h1> Q12: Identify the students who have the most connections.</h1>
<div class="notification">
<?php
$db_host = '127.0.0.1';
$db_user = 'root';
$db_password = 'root';
$db_db = 'INSY661Database';
$db_port = 8889;
$mysqli = new mysqli(
$db_host,
$db_user,
$db_password,
$db_db,
$db_port
);
if ($mysqli->connect_error) {
echo 'Errno: '.$mysqli->connect_errno;
echo '<br>';
echo 'Error: '.$mysqli->connect_error;
exit();
}
$sql = "SELECT stud_id, stud_fname, stud_lname, number_of_connect FROM (
SELECT stud_id, COUNT(DISTINCT fact_id) + COUNT(DISTINCT alum_id) AS 'number_of_connect'
FROM Stud_join
LEFT JOIN Alum_join USING(thread_id)
LEFT JOIN Fact_join USING(thread_id)
GROUP BY stud_id
) c
LEFT JOIN Students USING(stud_id)
WHERE number_of_connect = (
SELECT MAX(number_of_connect)
FROM (
SELECT stud_id, COUNT(DISTINCT fact_id) + COUNT(DISTINCT alum_id) AS 'number_of_connect'
FROM Stud_join
LEFT JOIN Alum_join USING(thread_id)
LEFT JOIN Fact_join USING(thread_id)
GROUP BY stud_id
) c1
)";
$res = $mysqli->query($sql);
echo '<table>';
echo '<tr>';
echo '<th>Student ID</th>';
echo '<th>First Name</th>';
echo '<th>Last Name</th>';
echo '<th>Number of Connections</th>';
echo '</tr>';
while ($row = $res->fetch_assoc()) {
echo '<tr>';
echo '<td>' . $row['stud_id'] . '</td>';
echo '<td>' . $row['stud_fname'] . '</td>';
echo '<td>' . $row['stud_lname'] . '</td>';
echo '<td>' . $row['number_of_connect'] . '</td>';
echo '</tr>';
}
echo '</table>';
$mysqli->close();
?>
</div>
</body>
</html>