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|
BEGIN;
BEGIN
SET client_min_messages TO NOTICE;
SET
/* :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 */
DROP TABLE IF EXISTS linegraph_edges;
NOTICE: table "linegraph_edges" does not exist, skipping
DROP TABLE
DROP TABLE IF EXISTS vertex_map;
NOTICE: table "vertex_map" does not exist, skipping
DROP TABLE
DROP TABLE IF EXISTS new_graph;
NOTICE: table "new_graph" does not exist, skipping
DROP TABLE
/* -- q0 */
SELECT id, source, target, cost, reverse_cost
FROM edges
WHERE id IN (4, 7, 8, 10);
id | source | target | cost | reverse_cost
----+--------+--------+------+--------------
4 | 6 | 7 | 1 | 1
7 | 3 | 7 | 1 | 1
8 | 7 | 11 | 1 | 1
10 | 7 | 8 | 1 | 1
(4 rows)
/* -- q1 */
SELECT * FROM pgr_lineGraphFull(
$$SELECT id, source, target, cost, reverse_cost
FROM edges
WHERE id IN (4, 7, 8, 10)$$);
seq | source | target | cost | edge
-----+--------+--------+------+------
1 | -1 | 7 | 1 | 4
2 | 6 | -1 | 0 | 0
3 | -2 | 6 | 1 | -4
4 | -3 | 3 | 1 | -7
5 | -4 | 11 | 1 | 8
6 | -5 | 8 | 1 | 10
7 | 7 | -2 | 0 | 0
8 | 7 | -3 | 0 | 0
9 | 7 | -4 | 0 | 0
10 | 7 | -5 | 0 | 0
11 | -6 | -2 | 0 | 0
12 | -6 | -3 | 0 | 0
13 | -6 | -4 | 0 | 0
14 | -6 | -5 | 0 | 0
15 | -7 | -2 | 0 | 0
16 | -7 | -3 | 0 | 0
17 | -7 | -4 | 0 | 0
18 | -7 | -5 | 0 | 0
19 | -8 | -2 | 0 | 0
20 | -8 | -3 | 0 | 0
21 | -8 | -4 | 0 | 0
22 | -8 | -5 | 0 | 0
23 | -9 | -6 | 1 | 7
24 | 3 | -9 | 0 | 0
25 | -10 | -7 | 1 | -8
26 | 11 | -10 | 0 | 0
27 | -11 | -8 | 1 | -10
28 | 8 | -11 | 0 | 0
(28 rows)
/* -- q2 */
SELECT seq AS id, source, target, cost, edge
INTO lineGraph_edges
FROM pgr_lineGraphFull(
$$SELECT id, source, target, cost, reverse_cost
FROM edges
WHERE id IN (4, 7, 8, 10)$$);
SELECT 28
/* -- q3 */
SELECT id, NULL::BIGINT original_id
INTO vertex_map
FROM vertices;
SELECT 17
/* -- q4 */
INSERT INTO vertex_map (id)
(SELECT id
FROM pgr_extractVertices(
$$SELECT id, source, target FROM lineGraph_edges$$) WHERE id < 0);
INSERT 0 11
/* -- q5 */
UPDATE vertex_map
SET original_id = id
WHERE id > 0;
UPDATE 17
/* -- q6 */
SELECT *
FROM vertex_map ORDER BY id DESC;
id | original_id
-----+-------------
17 | 17
16 | 16
15 | 15
14 | 14
13 | 13
12 | 12
11 | 11
10 | 10
9 | 9
8 | 8
7 | 7
6 | 6
5 | 5
4 | 4
3 | 3
2 | 2
1 | 1
-1 |
-2 |
-3 |
-4 |
-5 |
-6 |
-7 |
-8 |
-9 |
-10 |
-11 |
(28 rows)
/* -- q7 */
SELECT *, source AS targets_original_id
FROM lineGraph_edges
WHERE cost = 0 and source > 0;
id | source | target | cost | edge | targets_original_id
----+--------+--------+------+------+---------------------
2 | 6 | -1 | 0 | 0 | 6
7 | 7 | -2 | 0 | 0 | 7
8 | 7 | -3 | 0 | 0 | 7
9 | 7 | -4 | 0 | 0 | 7
10 | 7 | -5 | 0 | 0 | 7
24 | 3 | -9 | 0 | 0 | 3
26 | 11 | -10 | 0 | 0 | 11
28 | 8 | -11 | 0 | 0 | 8
(8 rows)
/* -- q8 */
WITH
self_loops AS (
SELECT DISTINCT source, target, source AS targets_original_id
FROM lineGraph_edges
WHERE cost = 0 and source > 0)
UPDATE vertex_map SET original_id = targets_original_id
FROM self_loops WHERE target = id;
UPDATE 8
/* -- q9 */
SELECT *
FROM vertex_map WHERE id < 0
ORDER BY id DESC;
id | original_id
-----+-------------
-1 | 6
-2 | 7
-3 | 7
-4 | 7
-5 | 7
-6 |
-7 |
-8 |
-9 | 3
-10 | 11
-11 | 8
(11 rows)
/* -- q10 */
WITH
assigned_vertices
AS (SELECT id, original_id
FROM vertex_map
WHERE original_id IS NOT NULL),
cross_edges
AS (SELECT DISTINCT e.source, v.original_id AS source_original_id
FROM lineGraph_edges AS e
JOIN vertex_map AS v ON (e.target = v.id)
WHERE source NOT IN (SELECT id FROM assigned_vertices)
)
UPDATE vertex_map SET original_id = source_original_id
FROM cross_edges WHERE source = id;
UPDATE 3
/* -- q11 */
SELECT *
FROM vertex_map WHERE id < 0
ORDER BY id DESC;
id | original_id
-----+-------------
-1 | 6
-2 | 7
-3 | 7
-4 | 7
-5 | 7
-6 | 7
-7 | 7
-8 | 7
-9 | 3
-10 | 11
-11 | 8
(11 rows)
/* -- q12 */
SELECT seq, path_seq, start_vid, end_vid, node, original_id, edge, cost, agg_cost
FROM (SELECT * FROM pgr_dijkstraNear(
$$SELECT * FROM lineGraph_edges$$,
(SELECT array_agg(id) FROM vertex_map where original_id = 6),
(SELECT array_agg(id) FROM vertex_map where original_id = 3))) dn
JOIN vertex_map AS v1 ON (node = v1.id);
seq | path_seq | start_vid | end_vid | node | original_id | edge | cost | agg_cost
-----+----------+-----------+---------+------+-------------+------+------+----------
3 | 3 | -1 | 3 | -3 | 7 | 4 | 1 | 1
1 | 1 | -1 | 3 | -1 | 6 | 1 | 1 | 0
4 | 4 | -1 | 3 | 3 | 3 | -1 | 0 | 2
2 | 2 | -1 | 3 | 7 | 7 | 8 | 0 | 1
(4 rows)
/* -- q13 */
SELECT edge FROM pgr_dijkstraNear(
$$SELECT * FROM lineGraph_edges$$,
(SELECT array_agg(id) FROM vertex_map where original_id = 6),
(SELECT array_agg(id) FROM vertex_map where original_id = 3))
WHERE cost = 0 AND seq != 1 AND edge != -1;
edge
------
8
(1 row)
/* -- q14 */
UPDATE lineGraph_edges
SET cost = 100
WHERE id IN (
SELECT edge FROM pgr_dijkstraNear(
$$SELECT * FROM lineGraph_edges$$,
(SELECT array_agg(id) FROM vertex_map where original_id = 6),
(SELECT array_agg(id) FROM vertex_map where original_id = 3))
WHERE cost = 0 AND seq != 1 AND edge != -1);
UPDATE 1
/* -- q15 */
WITH
results AS (
SELECT * FROM pgr_dijkstraNear(
$$SELECT * FROM lineGraph_edges$$,
(SELECT array_agg(id) FROM vertex_map where original_id = 6),
(SELECT array_agg(id) FROM vertex_map where original_id = 3)))
SELECT seq, path_seq, start_vid, end_vid, node, original_id, edge, cost, agg_cost
FROM results
LEFT JOIN vertex_map AS v1 ON (node = v1.id) ORDER BY seq;
seq | path_seq | start_vid | end_vid | node | original_id | edge | cost | agg_cost
-----+----------+-----------+---------+------+-------------+------+------+----------
1 | 1 | -1 | 3 | -1 | 6 | 1 | 1 | 0
2 | 2 | -1 | 3 | 7 | 7 | 10 | 0 | 1
3 | 3 | -1 | 3 | -5 | 7 | 6 | 1 | 1
4 | 4 | -1 | 3 | 8 | 8 | 28 | 0 | 2
5 | 5 | -1 | 3 | -11 | 8 | 27 | 1 | 2
6 | 6 | -1 | 3 | -8 | 7 | 20 | 0 | 3
7 | 7 | -1 | 3 | -3 | 7 | 4 | 1 | 3
8 | 8 | -1 | 3 | 3 | 3 | -1 | 0 | 4
(8 rows)
/* -- q16 */
WITH
u_turns AS (
SELECT e.id AS eid, v1.original_id
FROM linegraph_edges as e
JOIN vertex_map AS v1 ON (source = v1.id)
AND v1.original_id IN (3, 6, 8, 11))
UPDATE lineGraph_edges
SET source = original_id
FROM u_turns
WHERE id = eid;
UPDATE 8
/* -- q17 */
WITH
u_turns AS (
SELECT e.id AS eid, v1.original_id
FROM linegraph_edges as e
JOIN vertex_map AS v1 ON (target = v1.id)
AND v1.original_id IN (3, 6, 8, 11))
UPDATE lineGraph_edges
SET target = original_id
FROM u_turns
WHERE id = eid;
UPDATE 8
/* -- q18 */
SELECT * FROM linegraph_edges
WHERE source = target
ORDER BY id;
id | source | target | cost | edge
----+--------+--------+------+------
2 | 6 | 6 | 0 | 0
24 | 3 | 3 | 0 | 0
26 | 11 | 11 | 0 | 0
28 | 8 | 8 | 0 | 0
(4 rows)
/* -- q19 */
DELETE FROM linegraph_edges
WHERE source = target;
DELETE 4
/* -- q20 */
WITH
results AS (
SELECT * FROM pgr_dijkstra(
$$SELECT * FROM lineGraph_edges$$, 6, 3))
SELECT seq, path_seq, node, original_id, edge, cost, agg_cost
FROM results
LEFT JOIN vertex_map AS v1 ON (node = v1.id) ORDER BY seq;
seq | path_seq | node | original_id | edge | cost | agg_cost
-----+----------+------+-------------+------+------+----------
1 | 1 | 6 | 6 | 1 | 1 | 0
2 | 2 | 7 | 7 | 9 | 0 | 1
3 | 3 | -4 | 7 | 5 | 1 | 1
4 | 4 | 11 | 11 | 25 | 1 | 2
5 | 5 | -7 | 7 | 16 | 0 | 3
6 | 6 | -3 | 7 | 4 | 1 | 3
7 | 7 | 3 | 3 | -1 | 0 | 4
(7 rows)
/* -- q21 */
SELECT id, source, target, cost, reverse_cost
INTO new_graph from edges
WHERE id NOT IN (4, 7, 8, 10);
SELECT 14
/* -- q22 */
CREATE SEQUENCE new_graph_id_seq;
CREATE SEQUENCE
ALTER TABLE new_graph ALTER COLUMN id SET DEFAULT nextval('new_graph_id_seq');
ALTER TABLE
ALTER TABLE new_graph ALTER COLUMN id SET NOT NULL;
ALTER TABLE
ALTER SEQUENCE new_graph_id_seq OWNED BY new_graph.id;
ALTER SEQUENCE
SELECT setval('new_graph_id_seq', (SELECT max(id) FROM new_graph));
setval
--------
18
(1 row)
/* -- q23 */
INSERT INTO new_graph (source, target, cost, reverse_cost)
SELECT source, target, cost, -1 FROM lineGraph_edges;
INSERT 0 24
/* -- q24 */
WITH
results AS (
SELECT * FROM pgr_dijkstra(
$$SELECT * FROM new_graph$$, 6, 3))
SELECT seq, path_seq, node, original_id, edge, cost, agg_cost
FROM results
LEFT JOIN vertex_map AS v1 ON (node = v1.id) ORDER BY seq;
seq | path_seq | node | original_id | edge | cost | agg_cost
-----+----------+------+-------------+------+------+----------
1 | 1 | 6 | 6 | 35 | 1 | 0
2 | 2 | 7 | 7 | 20 | 0 | 1
3 | 3 | -4 | 7 | 41 | 1 | 1
4 | 4 | 11 | 11 | 37 | 1 | 2
5 | 5 | -7 | 7 | 27 | 0 | 3
6 | 6 | -3 | 7 | 40 | 1 | 3
7 | 7 | 3 | 3 | -1 | 0 | 4
(7 rows)
/* -- q25 */
WITH
results AS (
SELECT * FROM pgr_dijkstra(
$$SELECT * FROM new_graph$$, 5, 1))
SELECT seq, path_seq, node, original_id, edge, cost, agg_cost
FROM results
LEFT JOIN vertex_map AS v1 ON (node = v1.id) ORDER BY seq;
seq | path_seq | node | original_id | edge | cost | agg_cost
-----+----------+------+-------------+------+------+----------
1 | 1 | 5 | 5 | 1 | 1 | 0
2 | 2 | 6 | 6 | 35 | 1 | 1
3 | 3 | 7 | 7 | 20 | 0 | 2
4 | 4 | -4 | 7 | 41 | 1 | 2
5 | 5 | 11 | 11 | 37 | 1 | 3
6 | 6 | -7 | 7 | 27 | 0 | 4
7 | 7 | -3 | 7 | 40 | 1 | 4
8 | 8 | 3 | 3 | 6 | 1 | 5
9 | 9 | 1 | 1 | -1 | 0 | 6
(9 rows)
/* -- q26 */
ROLLBACK;
ROLLBACK
|
