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ClickHouse에서 매개변수화된 뷰를 사용하는 방법

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ClickHouse에서 매개변수화된 뷰 사용하기

매개변수화된 뷰(Parameterized View)는 쿼리 실행 시 전달되는 매개변수에 따라 데이터를 즉석에서 여러 방식으로 분석할 때 유용합니다.

다음 기본 예시를 참조하십시오:

  1. 테이블을 생성합니다
clickhouse-cloud :) CREATE TABLE raw_data (id UInt32, data String) ENGINE = MergeTree ORDER BY id

CREATE TABLE raw_data
(
`id` UInt32,
`data` String
)
ENGINE = MergeTree
ORDER BY id

Query id: aa21e614-1e10-4bba-88ce-4c7183a9148e

Ok.

0 rows in set. Elapsed: 0.332 sec.
  1. 예시용 무작위 데이터를 일부 삽입합니다
clickhouse-cloud :) INSERT INTO raw_data SELECT * FROM generateRandom('`id` UInt32,
`data` String',1,1) LIMIT 1000000;

INSERT INTO raw_data SELECT *
FROM generateRandom('`id` UInt32,
`data` String', 1, 1)
LIMIT 1000000

Query id: c552a34a-b72f-45e1-bed0-778923e1b5c9

Ok.

0 rows in set. Elapsed: 0.438 sec. Processed 1.05 million rows, 10.99 MB (2.39 million rows/s., 25.11 MB/s.)
  1. 매개변수화된 뷰를 생성하세요:
clickhouse-cloud :) CREATE VIEW raw_data_parametrized AS SELECT * FROM raw_data WHERE id BETWEEN {id_from:UInt32} AND {id_to:UInt32}

CREATE VIEW raw_data_parametrized AS
SELECT *
FROM raw_data
WHERE (id >= {id_from:UInt32}) AND (id <= {id_to:UInt32})

Query id: 45fb83a6-aa55-4197-a7cd-9e1ad2c76d48

Ok.

0 rows in set. Elapsed: 0.102 sec.
  1. FROM 절에 필요한 매개변수를 전달해 매개변수화된 뷰를 조회합니다:
clickhouse-cloud :) SELECT count() FROM raw_data_parametrized(id_from=0, id_to=50000);

SELECT count()
FROM raw_data_parametrized(id_from = 0, id_to = 50000)

Query id: 5731aae1-3e68-4e63-b57f-d50f29055744

┌

자세한 내용은 https://clickhouse.com/docs/sql-reference/statements/create/view#parameterized-view를 참고하십시오.

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