COPY INTO <location>

COPY loads data into Databend or unloads data from Databend.

This command unloads data from a table (or query) into one or more files in one of the following locations:

• Named internal stage: The files can be downloaded from the stage using the GET command.
• Named external stage: An external location (including Amazon S3).
• External location: An object storage system (including Amazon S3).

See Also: COPY INTO table

Syntax

COPY INTO { internalStage | externalStage | externalLocation }
FROM { [<database_name>.]<table_name> | ( <query> ) }
[ FILE_FORMAT = ( { TYPE = { CSV | JSON | NDJSON | PARQUET } [ formatTypeOptions ] } ) ]
[ copyOptions ]
[ VALIDATION_MODE = RETURN_ROWS ]

Where:

internalStage

internalStage ::= @<internal_stage_name>[/<path>]

externalStage

externalStage ::= @<external_stage_name>[/<path>]

externalLocation (for Amazon S3)

externalLocation (for Amazon S3) ::=
  's3://<bucket>[/<path>]'
  [ { CONNECTION = ( {  { AWS_KEY_ID = '<string>' AWS_SECRET_KEY = '<string>' } } ) } ]

参数	Description	Required
s3://<bucket>/[<path>]	Files are in the specified external location (S3-like bucket)	YES
[ { CONNECTION = ( { { AWS_KEY_ID = '<string>' AWS_SECRET_KEY = '<string>' } } ) } ]' ]	The credentials for connecting to AWS and accessing the private/protected S3 bucket where the files to load are staged.	Optional
[ ENDPOINT_URL = '<endpoint_url>' ]	S3-compatible endpoint URL like MinIO, default is https://s3.amazonaws.com	Optional

FILE_FORMAT

See Input & Output File Formats.

copyOptions

copyOptions ::=
  [ SINGLE = TRUE | FALSE ]
  [ MAX_FILE_SIZE = <num> ]

参数	Description	Required
SINGLE	When TRUE, the command unloads data into one single file. Default: FALSE.	Optional
MAX_FILE_SIZE	The maximum size (in bytes) of each file to be created. Effective when SINGLE is FALSE. Default: 67108864 (64 MB).	Optional

Examples

The following examples unload data into an internal stage:

-- Create a table
CREATE TABLE test_table (
     id INTEGER,
     name VARCHAR,
     age INT
);

-- Insert data into the table
INSERT INTO test_table (id,name,age) VALUES(1,'2',3), (4, '5', 6);

-- Create an internal stage
CREATE STAGE s2;

-- Unload the data in the table into a CSV file on the stage
COPY INTO @s2 FROM test_table FILE_FORMAT = (TYPE = 'CSV');

-- Unload the data from a query into a parquet file on the stage
COPY INTO @s2 FROM (SELECT name, age, id FROM test_table LIMIT 100) FILE_FORMAT = (TYPE = 'PARQUET');