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/* :file: This file is part of the pgRouting project.
:copyright: Copyright (c) 2018-2026 pgRouting developers
:license: Creative Commons Attribution-Share Alike 3.0 https://creativecommons.org/licenses/by-sa/3.0 */
/* -- q1 */
SELECT * FROM pgr_topologicalsort(
$$SELECT id, source, target, cost
FROM edges WHERE cost >= 0
UNION
SELECT id, target, source, reverse_cost
FROM edges WHERE cost < 0$$);
/* -- q2 */
SELECT * FROM pgr_topologicalsort(
$$SELECT id, source, target, cost, -1 AS reverse_cost
FROM edges WHERE cost >= 0
UNION
SELECT id, source, target, -1, reverse_cost
FROM edges WHERE cost < 0$$);
/* -- q3 */
SELECT * FROM pgr_topologicalsort(
$$SELECT id, source, target, cost, reverse_cost FROM edges$$);
/* -- q4 */
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