CSVWithNames

CSV 포맷 문서

입력	출력	별칭
✔	✔

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설명

TabSeparatedWithNames와 마찬가지로 컬럼 이름이 포함된 헤더 행도 출력합니다.

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사용 예시

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데이터 삽입

version 23.1부터 ClickHouse는 CSV 포맷 사용 시 CSV 파일의 헤더를 자동으로 감지하므로 CSVWithNames 또는 CSVWithNamesAndTypes를 사용할 필요가 없습니다.

다음과 같은 CSV 파일 football.csv를 사용합니다:

date,season,home_team,away_team,home_team_goals,away_team_goals
2022-04-30,2021,Sutton United,Bradford City,1,4
2022-04-30,2021,Swindon Town,Barrow,2,1
2022-04-30,2021,Tranmere Rovers,Oldham Athletic,2,0
2022-05-02,2021,Salford City,Mansfield Town,2,2
2022-05-02,2021,Port Vale,Newport County,1,2
2022-05-07,2021,Barrow,Northampton Town,1,3
2022-05-07,2021,Bradford City,Carlisle United,2,0
2022-05-07,2021,Bristol Rovers,Scunthorpe United,7,0
2022-05-07,2021,Exeter City,Port Vale,0,1
2022-05-07,2021,Harrogate Town A.F.C.,Sutton United,0,2
2022-05-07,2021,Hartlepool United,Colchester United,0,2
2022-05-07,2021,Leyton Orient,Tranmere Rovers,0,1
2022-05-07,2021,Mansfield Town,Forest Green Rovers,2,2
2022-05-07,2021,Newport County,Rochdale,0,2
2022-05-07,2021,Oldham Athletic,Crawley Town,3,3
2022-05-07,2021,Stevenage Borough,Salford City,4,2
2022-05-07,2021,Walsall,Swindon Town,0,3

테이블을 생성하세요:

CREATE TABLE football
(
    `date` Date,
    `season` Int16,
    `home_team` LowCardinality(String),
    `away_team` LowCardinality(String),
    `home_team_goals` Int8,
    `away_team_goals` Int8
)
ENGINE = MergeTree
ORDER BY (date, home_team);

CSVWithNames 포맷을 사용해 데이터를 삽입합니다:

INSERT INTO football FROM INFILE 'football.csv' FORMAT CSVWithNames;

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데이터 읽기

CSVWithNames 포맷을 사용해 데이터를 읽습니다:

SELECT *
FROM football
FORMAT CSVWithNames

출력은 헤더 행이 하나만 있는 CSV 포맷입니다:

"date","season","home_team","away_team","home_team_goals","away_team_goals"
"2022-04-30",2021,"Sutton United","Bradford City",1,4
"2022-04-30",2021,"Swindon Town","Barrow",2,1
"2022-04-30",2021,"Tranmere Rovers","Oldham Athletic",2,0
"2022-05-02",2021,"Port Vale","Newport County",1,2
"2022-05-02",2021,"Salford City","Mansfield Town",2,2
"2022-05-07",2021,"Barrow","Northampton Town",1,3
"2022-05-07",2021,"Bradford City","Carlisle United",2,0
"2022-05-07",2021,"Bristol Rovers","Scunthorpe United",7,0
"2022-05-07",2021,"Exeter City","Port Vale",0,1
"2022-05-07",2021,"Harrogate Town A.F.C.","Sutton United",0,2
"2022-05-07",2021,"Hartlepool United","Colchester United",0,2
"2022-05-07",2021,"Leyton Orient","Tranmere Rovers",0,1
"2022-05-07",2021,"Mansfield Town","Forest Green Rovers",2,2
"2022-05-07",2021,"Newport County","Rochdale",0,2
"2022-05-07",2021,"Oldham Athletic","Crawley Town",3,3
"2022-05-07",2021,"Stevenage Borough","Salford City",4,2
"2022-05-07",2021,"Walsall","Swindon Town",0,3

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포맷 설정

input_format_with_names_use_header 설정이 1로 지정되면, 입력 데이터의 컬럼이 이름을 기준으로 테이블의 컬럼에 매핑되며, input_format_skip_unknown_fields 설정이 1이면 알 수 없는 이름의 컬럼은 건너뜁니다. 그렇지 않으면 첫 번째 행을 건너뜁니다.