How do I: read files?

There are a couple of functions designed for DuckDB:

PRQL

from (read_parquet 'artists.parquet')
join (read_csv 'albums.csv') (==track_id)

SQL

WITH table_0 AS (
  SELECT
    *
  FROM
    read_parquet('artists.parquet')
),
table_1 AS (
  SELECT
    *
  FROM
    read_csv_auto('albums.csv')
)
SELECT
  table_0.*,
  table_1.*
FROM
  table_0
  JOIN table_1 ON table_0.track_id = table_1.track_id

Note

These don’t currently have all the DuckDB options. If those would be helpful, please log an issue and it’s a fairly easy addition.

Info

We may be able to reduce the boilerplate WITH table_x AS SELECT * FROM... in future versions.

See also