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COPY INTO <table> FROM STAGED FILES

COPY moves data between Databend tables and object storage systems (AWS S3 compatible object storage services and Azure Blob storage).

This command loads data into a table from files staged in one of the following locations:

  • Named internal stage, files can be staged using the PUT to Stage.
  • Named external stage that references an external location (AWS S3 compatible object storage services and Azure Blob storage).
  • External location. This includes AWS S3 compatible object storage services and Azure Blob storage.

COPY can also load data into a table from one or more remote files by their URL. See COPY INTO \<table> FROM FILES BY URL.

Syntax

COPY INTO [<database>.]<table_name>
FROM { internalStage | externalStage | externalLocation }
[ FILES = ( '<file_name>' [ , '<file_name>' ] [ , ... ] ) ]
[ PATTERN = '<regex_pattern>' ]
[ FILE_FORMAT = ( TYPE = { CSV | JSON | PARQUET } [ formatTypeOptions ] } ) ]
[ copyOptions ]

Where:

internalStage

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

externalStage

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

externalLocation

AWS S3 compatible object storage services:

externalLocation ::=
's3://<bucket>[<path>]'
CONNECTION = (
ENDPOINT_URL = 'https://<endpoint-URL>'
ACCESS_KEY_ID = '<your-access-key-ID>'
SECRET_ACCESS_KEY = '<your-secret-access-key>'
REGION = '<region-name>'
ENABLE_VIRTUAL_HOST_STYLE = true|false
)
ParameterDescriptionRequired
s3://<bucket>[<path>]External files located at the AWS S3 compatible object storage.Optional
ENDPOINT_URLThe bucket endpoint URL starting with "https://". To use a URL starting with "http://", set allow_insecure to true in the [storage] block of the file databend-query-node.toml.Optional
ACCESS_KEY_IDYour access key ID for connecting the AWS S3 compatible object storage. If not provided, Databend will access the bucket anonymously.Optional
SECRET_ACCESS_KEYYour secret access key for connecting the AWS S3 compatible object storage.Optional
REGIONAWS region name. For example, us-east-1.Optional
ENABLE_VIRTUAL_HOST_STYLEIf you use virtual hosting to address the bucket, set it to "true".Optional

Azure Blob storage:

externalLocation ::=
'azblob://<container>[<path>]'
CONNECTION = (
ENDPOINT_URL = 'https://<endpoint-URL>'
ACCOUT_NAME = '<your-account-name>'
ACCOUNT_KEY = '<your-account-key>'
)
ParameterDescriptionRequired
azblob://<container>[<path>]External files located at the Azure Blob storage.Required
ENDPOINT_URLThe container endpoint URL starting with "https://". To use a URL starting with "http://", set allow_insecure to true in the [storage] block of the file databend-query-node.toml.Optional
ACCOUNT_NAMEYour account name for connecting the Azure Blob storage. If not provided, Databend will access the container anonymously.Optional
ACCOUNT_KEYYour account key for connecting the Azure Blob storage.Optional

FILES = ( 'file_name' [ , 'file_name' ... ] )

Specifies a list of one or more files names (separated by commas) to be loaded.

PATTERN = 'regex_pattern'

A regular expression pattern string, enclosed in single quotes, specifying the file names to match.

formatTypeOptions

formatTypeOptions ::=
RECORD_DELIMITER = '<character>'
FIELD_DELIMITER = '<character>'
SKIP_HEADER = <integer>
COMPRESSION = AUTO | GZIP | BZ2 | BROTLI | ZSTD | DEFLATE | RAW_DEFLATE | NONE

RECORD_DELIMITER = '<character>'

Description: One character that separate records in an input file.

Default: '\n'

FIELD_DELIMITER = '<character>'

Description: One character that separate fields in an input file.

Default: ',' (comma)

SKIP_HEADER = '<integer>'

Description: Number of lines at the start of the file to skip.

Default: 0

COMPRESSION = AUTO | GZIP | BZ2 | BROTLI | ZSTD | DEFLATE | RAW_DEFLATE | XZ | NONE

Description: String that represents the compression algorithm.

Default: NONE

Values:

ValuesNotes
AUTOAuto detect compression via file extensions
GZIP
BZ2
BROTLIMust be specified if loading/unloading Brotli-compressed files.
ZSTDZstandard v0.8 (and higher) is supported.
DEFLATEDeflate-compressed files (with zlib header, RFC1950).
RAW_DEFLATEDeflate-compressed files (without any header, RFC1951).
XZ
NONEIndicates that the files have not been compressed.

copyOptions

copyOptions ::=
[ SIZE_LIMIT = <num> ]
ParametersDescriptionRequired
SIZE_LIMIT = <num>Number (> 0) that specifies the maximum rows of data to be loaded for a given COPY statement. Default 0Optional

Examples

Loading Files from Internal Stage

First, create a named internal stage:

CREATE STAGE my_internal_s1;

Then, PUT a local file to my_internal_s1 stage with PUT to Stage API:

curl  -H "stage_name:my_internal_s1" -F "upload=@books.parquet" -XPUT "http://localhost:8081/v1/upload_to_stage"

Finally, copy the file into mytable from the my_internal_s1 named internal stage:

LIST @my_internal_s1;
COPY INTO mytable FROM @my_internal_s1 pattern = 'books.*parquet' file_format = (type = 'PARQUET');

Loading Files from External Stage

First, create a named external stage:

CREATE STAGE my_external_s1 url = 's3://testbucket/admin/data/' credentials=(aws_key_id='minioadmin' aws_secret_key='minioadmin');

Then, copy the file into mytable from the my_external_s1 named external stage:

COPY INTO mytable FROM @my_external_s1 pattern = 'books.*parquet' file_format = (type = 'PARQUET');

Loading Files Directly from External Location

AWS S3 compatible object storage services

This example reads 10 rows from a CSV file and inserts them into a table:

COPY INTO mytable
FROM 's3://mybucket/data.csv'
CONNECTION = (
ENDPOINT_URL = 'https://<endpoint-URL>'
ACCESS_KEY_ID = '<your-access-key-ID>'
SECRET_ACCESS_KEY = '<your-secret-access-key>')
FILE_FORMAT = (type = 'CSV' field_delimiter = ',' record_delimiter = '\n' skip_header = 1) size_limit=10;

This example reads 10 rows from a CSV file compressed as GZIP and inserts them into a table:

COPY INTO mytable
FROM 's3://mybucket/data.csv.gz'
CONNECTION = (
ENDPOINT_URL = 'https://<endpoint-URL>'
ACCESS_KEY_ID = '<your-access-key-ID>'
SECRET_ACCESS_KEY = '<your-secret-access-key>')
FILE_FORMAT = (type = 'CSV' field_delimiter = ',' record_delimiter = '\n' skip_header = 1 compression = GZIP) size_limit=10;

This example moves data from a CSV file without specifying the endpoint URL:

COPY INTO mytable
FROM 's3://mybucket/data.csv'
FILE_FORMAT = (type = 'CSV' field_delimiter = ',' record_delimiter = '\n' skip_header = 1) size_limit=10;

Azure Blob storage

This example reads data from a CSV file and inserts them into a table:

COPY INTO mytable
FROM 'azblob://mybucket/data.csv'
CONNECTION = (
ENDPOINT_URL = 'https://<account_name>.blob.core.windows.net'
ACCOUNT_NAME = '<account_name>'
ACCOUNT_KEY = '<account_key>'
)