[snip]
The following query seems to return an empty string, which should only
give
me the total for the entire column anyway.
$query = "SELECT SUM(Revenue) FROM Sales WHERE Date='$Date'";
[/snip]

$query = "SELECT SUM(Revenue) AS Revenue FROM Sales WHERE Date='$Date'";
note the AS statement---------^

$foo = mysql_query($query, $connection);

$bar = mysql_fetch_array($foo);

echo $bar['Revenue']

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