Source code of dbFindAverageGood2.php
<html>
<head>
<title>Find Average Item Price</title>
</head>
<body>
<h2>Find Average Item Price</h2>
<?php
$lines = file("mysql.txt");
$password = trim($lines[0]);
$dbLink = mysql_connect("localhost", "tboegel", $password);
mysql_select_db("clearwater", $dbLink);
$query = "SELECT avg(inv_price) as average_price, cat_desc "
. "FROM inventory, item, category "
. "WHERE inventory.item_id = item.item_id "
. "AND category.cat_id = item.cat_id "
. "GROUP BY cat_desc";
$recordset = mysql_query($query, $dbLink);
print "<table>";
print "<tr><td>Category</td><td>Average Price</td></tr>";
while($row = mysql_fetch_assoc($recordset)) {
print "<tr>";
print "<td>{$row['cat_desc']}</td>";
printf("<td>\$%.2f</td>", $row['average_price']);
print "</tr>";
}
print "</table>";
?>
</body>
</html>