mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-23 08:02:02 +00:00
34 lines
1.0 KiB
MySQL
34 lines
1.0 KiB
MySQL
|
DROP TABLE IF EXISTS table_with_compact_parts;
|
||
|
|
|
||
|
|
CREATE TABLE table_with_compact_parts
|
||
|
|
(
|
||
|
|
date Date,
|
||
|
|
key UInt64,
|
||
|
|
value1 String,
|
||
|
|
value2 String,
|
||
|
|
value3 String
|
||
|
|
)
|
||
|
|
ENGINE = MergeTree()
|
||
|
|
PARTITION BY date
|
||
|
|
ORDER BY key
|
||
|
|
settings index_granularity = 8,
|
||
|
|
min_rows_for_wide_part = 10;
|
||
|
|
|
||
|
|
INSERT INTO table_with_compact_parts SELECT toDate('2019-10-01') + number % 3, number, toString(number), toString(number), toString(number) from numbers(9);
|
||
|
|
|
||
|
|
SELECT value1 FROM table_with_compact_parts WHERE key = 1;
|
||
|
|
|
||
|
|
ALTER TABLE table_with_compact_parts RENAME COLUMN value1 to renamed_value1;
|
||
|
|
|
||
|
|
SELECT renamed_value1 FROM table_with_compact_parts WHERE key = 1;
|
||
|
|
|
||
|
|
SELECT * FROM table_with_compact_parts WHERE key = 1 FORMAT TSVWithNames;
|
||
|
|
|
||
|
|
ALTER TABLE table_with_compact_parts RENAME COLUMN value2 TO renamed_value2, RENAME COLUMN value3 TO renamed_value3;
|
||
|
|
|
||
|
|
SELECT renamed_value2, renamed_value3 FROM table_with_compact_parts WHERE key = 7;
|
||
|
|
|
||
|
|
SELECT * FROM table_with_compact_parts WHERE key = 7 FORMAT TSVWithNames;
|
||
|
|
|
||
|
|
DROP TABLE IF EXISTS table_with_compact_parts;
|