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Unloading NDJSON File

Unloading TSV File

Syntax:

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

Tutorial

Step 1. Create an External Stage

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

Step 2. Create Custom NDJSON File Format

CREATE FILE FORMAT ndjson_unload_format 
TYPE = NDJSON,
COMPRESSION = gzip; -- Unload with gzip compression

Step 3. Unload into NDJSON File

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

Result:

┌─────────────────────────────────────────────────────────────────────────────────────────────┐
│ file_name │ file_size │ row_count │
├─────────────────────────────────────────────────────────────────────┼───────────┼───────────┤
│ data_068976e5-2072-4ad8-9887-16fb9129ed80_0000_00000000.ndjson.gz │ 263 │ 100 │
└─────────────────────────────────────────────────────────────────────────────────────────────┘

Step 4. Verify the Unloaded NDJSON Files

SELECT COUNT($1)
FROM @ndjson_unload_stage
(
FILE_FORMAT => 'ndjson_unload_format',
PATTERN => '.*[.]ndjson[.]gz'
);

Result:

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