DuckDB-Px

This DuckDB extension allows you read Px-files. .px is file format used to publish and distribute (official) statistics. For example, the statistical offices of sweden, denmark and finland distribute data in this format (among others).

Usage

After a build/install, you can write arbitrary SQL-queries over px-files with the read_px function:

SELECT * FROM read_px('your_dataset.px');

Schema

The function returns all variables defined with keywords STUB or HEADING as varchar-columns. The actual values for the these columns are derived from associated CODE-keyword definitions.

Data under the DATA-keyword are represented in a single column called value which is an integer or a decimal.

The type of value-field is a guess based on the DECIMALS-keyword.

• If DECIMALS = 0, the type is INTEGER
• If DECIMALS > 0, the type is DECIMAL(17,x) where x is the value of DECIMALS

Building

Build steps

Now to build the extension, run:

make

Running the extension

To run the extension code, simply start the shell with ./build/release/duckdb.

Now we can use the features from the extension directly in DuckDB.

Running the tests

Different tests can be created for DuckDB extensions. The primary way of testing DuckDB extensions should be the SQL tests in ./test/sql. These SQL tests can be run using:

make test

Installing the deployed binaries

To install your extension binaries from S3, you will need to do two things. Firstly, DuckDB should be launched with the allow_unsigned_extensions option set to true. How to set this will depend on the client you're using. Some examples:

CLI:

duckdb -unsigned

Python:

con = duckdb.connect(':memory:', config={'allow_unsigned_extensions' : 'true'})

NodeJS:

db = new duckdb.Database(':memory:', {"allow_unsigned_extensions": "true"});

Secondly, you will need to set the repository endpoint in DuckDB to the HTTP url of your bucket + version of the extension you want to install. To do this run the following SQL query in DuckDB:

SET custom_extension_repository='bucket.s3.eu-west-1.amazonaws.com/px/latest';

Note that the /latest path will allow you to install the latest extension version available for your current version of DuckDB. To specify a specific version, you can pass the version instead.

After running these steps, you can install and load your extension using the regular INSTALL/LOAD commands in DuckDB:

INSTALL px
LOAD px

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This repository is based on https://github.com/duckdb/extension-template, check it out if you want to build and ship your own DuckDB extension.