mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-05 22:12:21 +00:00
26 lines
948 B
SQL
26 lines
948 B
SQL
SET group_by_two_level_threshold_bytes = 1;
|
|
SET group_by_two_level_threshold = 1;
|
|
|
|
SELECT groupArray(DISTINCT toString(number % 10)) FROM numbers_mt(50000)
|
|
GROUP BY number ORDER BY number LIMIT 10
|
|
SETTINGS max_threads = 2, max_block_size = 2000;
|
|
|
|
DROP TABLE IF EXISTS distinct_two_level;
|
|
|
|
CREATE TABLE distinct_two_level (
|
|
time DateTime64(3),
|
|
domain String,
|
|
subdomain String
|
|
) ENGINE = MergeTree ORDER BY time;
|
|
|
|
INSERT INTO distinct_two_level SELECT 1546300800000, 'test.com', concat('foo', toString(number % 10000)) from numbers(10000);
|
|
INSERT INTO distinct_two_level SELECT 1546300800000, concat('test.com', toString(number / 10000)) , concat('foo', toString(number % 10000)) from numbers(10000);
|
|
|
|
SELECT
|
|
domain, arrayUniq(groupArraySample(5, 11111)(DISTINCT subdomain)) AS example_subdomains
|
|
FROM distinct_two_level
|
|
GROUP BY domain ORDER BY domain, example_subdomains
|
|
LIMIT 10;
|
|
|
|
DROP TABLE IF EXISTS distinct_two_level;
|