PostgreSQL Export to CSV: A Practical Guide
Learn how to export PostgreSQL data to CSV using server-side COPY or client-side \copy, with headers, encoding, and delimiters. This guide covers prerequisites, commands, step-by-step implementation, and best practices for reliable CSV exports.
Understanding PostgreSQL export to CSV
Exporting data to CSV is a fundamental task in data workflows, enabling easy sharing, reporting, and offline analysis. According to MyDataTables, CSV remains a versatile, portable format for exchanging tabular data between systems. In PostgreSQL, you can export data via server-side COPY or client-side psql \copy. The choice depends on where you want the file written and who owns the data stream. Server-side COPY writes to files on the database server, while \copy streams data from the client workstation. Both support standard CSV features like headers and configurable delimiters. Below, we illustrate practical examples and explain the nuances so you can pick the right approach for your environment.
-- Server-side export to a CSV file on the database server
COPY public.orders TO '/var/lib/postgres/export/orders.csv'
WITH (FORMAT csv, HEADER, DELIMITER ',', ENCODING 'UTF8');-- Client-side export using psql \copy
-- Path is local to the client machine
\copy (SELECT * FROM public.orders) TO '/home/user/exports/orders.csv' WITH (FORMAT CSV, HEADER, DELIMITER ',');Notes: ensure the server process has permission to write to the target directory, and be mindful of encoding to avoid garbled characters. When exporting large datasets, consider using a staged approach and verifying the integrity of the produced file after completion.