mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-27 18:12:02 +00:00
25 lines
992 B
SQL
25 lines
992 B
SQL
-- https://github.com/ClickHouse/ClickHouse/issues/9587#issuecomment-944431385
|
|
|
|
CREATE TABLE source (a Int32) ENGINE=MergeTree() ORDER BY tuple();
|
|
CREATE TABLE source_null AS source ENGINE=Null;
|
|
CREATE TABLE dest_a (count UInt32, min Int32, max Int32, count_subquery Int32, min_subquery Int32, max_subquery Int32) ENGINE=MergeTree() ORDER BY tuple();
|
|
|
|
CREATE MATERIALIZED VIEW mv_null TO source_null AS SELECT * FROM source;
|
|
CREATE MATERIALIZED VIEW mv_a to dest_a AS
|
|
SELECT
|
|
count() AS count,
|
|
min(a) AS min,
|
|
max(a) AS max,
|
|
(SELECT count() FROM source_null) AS count_subquery,
|
|
(SELECT min(a) FROM source_null) AS min_subquery,
|
|
(SELECT max(a) FROM source_null) AS max_subquery
|
|
FROM source_null
|
|
GROUP BY count_subquery, min_subquery, max_subquery;
|
|
|
|
|
|
INSERT INTO source SELECT number FROM numbers(2000) SETTINGS min_insert_block_size_rows=1500, max_insert_block_size=1500;
|
|
|
|
SELECT count() FROM source;
|
|
SELECT count() FROM dest_a;
|
|
SELECT * from dest_a ORDER BY count DESC;
|