$results = array();

    foreach ($tables as $table) {

        $sql = sprintf("
                SELECT id,
                    %s as customer,
                    status,
                    status_error,
                    submit_datetime,
                FROM stats.%s
                WHERE direction = %s
            ",
            $config['customer_field'],
            $table,
            $config['direction'],
        );

        $results[$table] = $dbh->exec( $sql );
    }

    return $results;