how about using limit 0,1limit 0,1 for mysql optimisation
and about your code:
$DBH = new PDO( "connection string goes here" );
$STH - $DBH -> prepare( "select figure from table1" );
$STH -> execute();
$result = $STH ->fetch(PDO::FETCH_ASSOC)
echo $result["figure"];
$DBH = null;