Unloading TSV File

Unloading TSV File

Syntax:

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

• More TSV options refer to TSV 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>

Tutorial

Step 1. Create an External Stage

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

Step 2. Create Custom TSV File Format

CREATE FILE FORMAT tsv_unload_format 
    TYPE = TSV,
    COMPRESSION = gzip;     -- Unload with gzip compression

Step 3. Unload into TSV File

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

Result:

┌──────────────────────────────────────────────────────────────────────────────────────────┐
│                             file_name                            │ file_size │ row_count │
├──────────────────────────────────────────────────────────────────┼───────────┼───────────┤
│   data_99e8f5c8-79d6-43d8-80d7-13e3f4c91dd5_0002_00000000.tsv.gz │       160 │       100 │
└──────────────────────────────────────────────────────────────────────────────────────────┘

Step 4. Verify the Unloaded TSV Files

SELECT COUNT($1)
FROM @tsv_unload_stage
(
    FILE_FORMAT => 'tsv_unload_format',
    PATTERN => '.*[.]tsv[.]gz'
);

Result:

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