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Showing content from https://docs.databend.com/guides/unload-data/unload-csv below:

Unloading CSV File | Databend

Syntax:

COPY INTO { internalStage | externalStage | externalLocation }
FROM { [<database_name>.]<table_name> | ( <query> ) }
FILE_FORMAT = (
    TYPE = CSV,
    RECORD_DELIMITER = '<character>',
    FIELD_DELIMITER = '<character>',
    COMPRESSION = gzip,
    OUTPUT_HEADER = true 
)
[MAX_FILE_SIZE = <num>]
[DETAILED_OUTPUT = true | false]

• More CSV options refer to CSV File Format Options
• Unloading into multiple files use the MAX_FILE_SIZE Copy Option
• More details about the syntax can be found in COPY INTO location

CREATE STAGE csv_unload_stage
URL = 's3://unload/csv/'
CONNECTION = (
    ACCESS_KEY_ID = '<your-access-key-id>'
    SECRET_ACCESS_KEY = '<your-secret-access-key>'
);

CREATE FILE FORMAT csv_unload_format
    TYPE = CSV,
    RECORD_DELIMITER = '\n',
    FIELD_DELIMITER = ',',
    COMPRESSION = gzip,     
    OUTPUT_HEADER = true,   
    SKIP_HEADER = 1;        

COPY INTO @csv_unload_stage
FROM (
    SELECT *
    FROM generate_series(1, 100)
)
FILE_FORMAT = (FORMAT_NAME = 'csv_unload_format')
DETAILED_OUTPUT = true;

Result:

┌──────────────────────────────────────────────────────────────────────────────────────────┐
│                             file_name                            │ file_size │ row_count │
├──────────────────────────────────────────────────────────────────┼───────────┼───────────┤
│   data_c8382216-0a04-4920-9eca-7b5debe3eed6_0000_00000000.csv.gz │       187 │       100 │
└──────────────────────────────────────────────────────────────────────────────────────────┘

SELECT COUNT($1)
FROM @csv_unload_stage
(
    FILE_FORMAT => 'csv_unload_format',
    PATTERN => '.*[.]csv[.]gz'
);

Result:

┌───────────┐
│ count($1) │
├───────────┤
│       100 │
└───────────┘

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