<?php
// use constants to define your db-related values
define('DB_USERNAME', 'username');
define('DB_PASSWORD', 'secret');
define('DB_HOST', 'localhost');
define('DB_NAME', 'mydb');
// create your db connection
$connection = @mysql_pconnect(DB_HOST, DB_USERNAME, DB_PASSWORD)
or die("<p>Couldn't connect to database: ".mysql_error()."</p>");
// select your db
$db = @mysql_select_db(DB_NAME, $connection)
or die("<p>Couldn't select database: ".mysql_error()."</p>");
// create your query
$sql = "SELECT title
FROM tblReviews
WHERE ReviewTitle LIKE '$Letter%'";
// execute query
$result = @mysql_query($sql, $connection)
or die("<p>Couldn't execute query: ".mysql_error()."</p>");
// loop through the query results
while ($row = mysql_fetch_array($result))
{
echo $row['title']."<br />";
}
?>
Here's a pretty good online article to help you out as well:
http://www.sitepoint.com/article/php-amp-mysql-1-installation
HTH