mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-11 01:54:55 +00:00
47 lines
1.8 KiB
SQL
47 lines
1.8 KiB
SQL
DROP TABLE IF EXISTS in_memory;
|
|
CREATE TABLE in_memory (a UInt32, b UInt32)
|
|
ENGINE = MergeTree ORDER BY a
|
|
SETTINGS min_rows_for_compact_part = 1000, min_rows_for_compact_part = 1000;
|
|
|
|
INSERT INTO in_memory SELECT number, number % 3 FROM numbers(100);
|
|
SELECT 'system.parts';
|
|
SELECT DISTINCT part_type, marks FROM system.parts WHERE database = currentDatabase() AND table = 'in_memory' AND active;
|
|
SELECT DISTINCT data_uncompressed_bytes > 0 FROM system.parts WHERE database = currentDatabase() AND table = 'in_memory' AND active;
|
|
SELECT DISTINCT column_data_uncompressed_bytes > 0 FROM system.parts_columns WHERE database = currentDatabase() AND table = 'in_memory' AND active;
|
|
|
|
SELECT 'Simple selects';
|
|
|
|
SELECT * FROM in_memory ORDER BY a LIMIT 5;
|
|
SELECT * FROM in_memory ORDER BY a LIMIT 5 OFFSET 50;
|
|
SELECT count() FROM in_memory WHERE b = 0 SETTINGS max_block_size = 10;
|
|
-- Check index
|
|
SELECT count() FROM in_memory WHERE a > 100 SETTINGS max_rows_to_read = 0, force_primary_key = 1;
|
|
SELECT count() FROM in_memory WHERE a >= 10 AND a < 30 SETTINGS force_primary_key = 1;
|
|
SELECT DISTINCT blockSize() FROM in_memory SETTINGS max_block_size = 10;
|
|
|
|
SELECT 'Mutations and Alters';
|
|
SET mutations_sync = 1;
|
|
|
|
ALTER TABLE in_memory DELETE WHERE b = 0;
|
|
|
|
SELECT count() FROM in_memory;
|
|
SELECT * FROM in_memory ORDER BY a LIMIT 5;
|
|
|
|
ALTER TABLE in_memory ADD COLUMN arr Array(UInt64);
|
|
ALTER TABLE in_memory UPDATE arr = [a, a * a] WHERE b = 1;
|
|
|
|
SELECT arr FROM in_memory ORDER BY a LIMIT 5;
|
|
|
|
ALTER TABLE in_memory MODIFY COLUMN b String;
|
|
ALTER TABLE in_memory RENAME COLUMN b to str;
|
|
SELECT DISTINCT str, length(str) FROM in_memory ORDER BY str;
|
|
ALTER TABLE in_memory DROP COLUMN str;
|
|
|
|
SELECT * FROM in_memory ORDER BY a LIMIT 5;
|
|
|
|
-- in-memory parts works if they're empty.
|
|
ALTER TABLE in_memory DELETE WHERE 1;
|
|
SELECT count() FROM in_memory;
|
|
|
|
DROP TABLE in_memory;
|