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