SELECT rt.route_beg, 
rt.route_end, 
n_1.node_name AS node_name_beg, 
n_2.node_name AS node_name_end, 
COUNT(rt.route_beg) as grp_count 
FROM vi_route rt 
INNER JOIN vi_nodes n_1 
ON ( rt.net_id = n_1.net_id AND rt.route_beg = n_1.node_id ) 
INNER JOIN vi_nodes n_2 
ON ( rt.net_id = n_2.net_id AND rt.route_end = n_2.node_id )
WHERE ( n_1.net_id = ? ) 
GROUP BY rt.route_beg, rt.route_end, n_1.node_name, n_2.node_name 
ORDER BY node_name_beg: 'param_value'