mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-05 14:02:21 +00:00
90 lines
2.9 KiB
SQL
90 lines
2.9 KiB
SQL
/**
|
|
* Based on https://github.com/postgres/postgres/blob/master/src/test/regress/sql/with.sql, license:
|
|
*
|
|
* PostgreSQL Database Management System
|
|
* (formerly known as Postgres, then as Postgres95)
|
|
*
|
|
* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
|
|
*
|
|
* Portions Copyright (c) 1994, The Regents of the University of California
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software and its
|
|
* documentation for any purpose, without fee, and without a written agreement
|
|
* is hereby granted, provided that the above copyright notice and this
|
|
* paragraph and the following two paragraphs appear in all copies.
|
|
*
|
|
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
|
|
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
|
|
* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
|
|
* DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
|
|
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
|
|
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
|
|
*PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
*/
|
|
|
|
--
|
|
-- Tests for common table expressions (WITH query, ... SELECT ...)
|
|
--
|
|
|
|
-- { echoOn }
|
|
|
|
SET allow_experimental_analyzer = 1;
|
|
|
|
--
|
|
-- different tree example
|
|
--
|
|
DROP TABLE IF EXISTS tree;
|
|
CREATE TABLE tree(
|
|
id UInt64,
|
|
parent_id Nullable(UInt64)
|
|
)
|
|
ENGINE=TinyLog;
|
|
|
|
INSERT INTO tree
|
|
VALUES (1, NULL), (2, 1), (3,1), (4,2), (5,2), (6,2), (7,3), (8,3), (9,4), (10,4), (11,7), (12,7), (13,7), (14, 9), (15,11), (16,11);
|
|
|
|
--
|
|
-- get all paths from "second level" nodes to leaf nodes
|
|
--
|
|
WITH RECURSIVE t AS (
|
|
SELECT 1 AS id, []::Array(UInt64) AS path
|
|
UNION ALL
|
|
SELECT tree.id, arrayConcat(t.path, [tree.id])
|
|
FROM tree JOIN t ON (tree.parent_id = t.id)
|
|
)
|
|
SELECT t1.*, t2.* FROM t AS t1 JOIN t AS t2 ON
|
|
(t1.path[1] = t2.path[1] AND
|
|
length(t1.path) = 1 AND
|
|
length(t2.path) > 1)
|
|
ORDER BY t1.id, t2.id;
|
|
|
|
-- just count 'em
|
|
WITH RECURSIVE t AS (
|
|
SELECT 1 AS id, []::Array(UInt64) AS path
|
|
UNION ALL
|
|
SELECT tree.id, arrayConcat(t.path, [tree.id])
|
|
FROM tree JOIN t ON (tree.parent_id = t.id)
|
|
)
|
|
SELECT t1.id, count(t2.path) FROM t AS t1 JOIN t AS t2 ON
|
|
(t1.path[1] = t2.path[1] AND
|
|
length(t1.path) = 1 AND
|
|
length(t2.path) > 1)
|
|
GROUP BY t1.id
|
|
ORDER BY t1.id;
|
|
|
|
-- -- this variant tickled a whole-row-variable bug in 8.4devel
|
|
WITH RECURSIVE t AS (
|
|
SELECT 1 AS id, []::Array(UInt64) AS path
|
|
UNION ALL
|
|
SELECT tree.id, arrayConcat(t.path, [tree.id])
|
|
FROM tree JOIN t ON (tree.parent_id = t.id)
|
|
)
|
|
SELECT t1.id, t2.path, tuple(t2.*) FROM t AS t1 JOIN t AS t2 ON
|
|
(t1.id=t2.id);
|
|
|
|
-- { echoOff }
|