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/* :file: This file is part of the pgRouting project.
:copyright: Copyright (c) 2016-2026 pgRouting developers
:license: Creative Commons Attribution-Share Alike 3.0 https://creativecommons.org/licenses/by-sa/3.0 */
/* -- q1 */
SELECT * FROM pgr_lineGraph(
'SELECT id, source, target, cost, reverse_cost
FROM edges WHERE id IN (2,4,5,8)',
false);
/* -- q2 */
CREATE TABLE edges_shared (
id BIGINT,
source BIGINT,
target BIGINT,
cost FLOAT,
reverse_cost FLOAT,
geom geometry
);
INSERT INTO edges_shared (id, source, target, cost, reverse_cost, geom) VALUES
(102, 1, 2, 1, -1, ST_MakeLine(ST_POINT(0, 2), ST_POINT(2, 2))),
(104, 1, 4, 1, -1, ST_MakeLine(ST_POINT(0, 2), ST_POINT(0, 0))),
(301, 3, 1, 1, -1, ST_MakeLine(ST_POINT(2, 0), ST_POINT(0, 2))),
(203, 2, 3, 1, 1, ST_MakeLine(ST_POINT(2, 2), ST_POINT(2, 0))),
(304, 3, 4, 1, 1, ST_MakeLine(ST_POINT(0, 0), ST_POINT(2, 0)));
SELECT seq, source, target, cost, reverse_cost
FROM pgr_lineGraph(
'SELECT id, source, target, cost, reverse_cost FROM edges_shared',
true);
/* -- q3 */
CREATE TABLE edges_unique (
id BIGINT,
source BIGINT,
target BIGINT,
cost FLOAT,
geom geometry
);
INSERT INTO edges_unique (id, source, target, cost, geom) VALUES
(102, 1, 2, 1, ST_MakeLine(ST_POINT(0, 2), ST_POINT(2, 2))),
(104, 1, 4, 1, ST_MakeLine(ST_POINT(0, 2), ST_POINT(0, 0))),
(301, 3, 1, 1, ST_MakeLine(ST_POINT(2, 0), ST_POINT(0, 2))),
(203, 2, 3, 1, ST_MakeLine(ST_POINT(2, 2), ST_POINT(2, 0))),
(304, 3, 4, 1, ST_MakeLine(ST_POINT(2, 0), ST_POINT(0, 0))),
(302, 3, 2, 1, ST_MakeLine(ST_POINT(2, 0), ST_POINT(2, 2))),
(403, 4, 3, 1, ST_MakeLine(ST_POINT(0, 0), ST_POINT(2, 0)));
SELECT seq, source, target, cost, reverse_cost
FROM pgr_lineGraph(
'SELECT id, source, target, cost FROM edges_unique',
true);
/* -- q4 */
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