1set client_min_messages to ERROR;
2
3\i load_topology.sql
4
5SELECT 'R'||edge_id, (topology.GetRingEdges('city_data', edge_id)).*
6	FROM city_data.edge;
7
8SELECT 'R-'||edge_id, (topology.GetRingEdges('city_data', -edge_id)).*
9	FROM city_data.edge;
10
11SELECT topology.DropTopology('city_data');
12