Export Table to CSV File | PostgreSQL Tutorial

Export Table to CSV File in Import / Export helps you write SQL that is easier to test, review, and operate at scale.

Introduction to Export Table to CSV File

Use Export Table to CSV File to move data between PostgreSQL and external files without losing control.

Commonly paired with: SELECT, FROM, LIMIT, WITH.

Practical examples with Export Table to CSV File in PostgreSQL

Reference pattern: start from canonical syntax and keep it explicit.

COPY (
  SELECT order_id, total_amount, placed_at
  FROM orders
  WHERE placed_at >= current_date - interval '30 days'
) TO '/tmp/orders_30d.csv'
WITH (FORMAT csv, HEADER true);

Production-style scenario: apply the same concept to realistic application data.

SELECT
  o.order_id,
  o.total_amount,
  o.placed_at
FROM orders o
WHERE o.placed_at >= now() - interval '30 days'
ORDER BY o.placed_at DESC
LIMIT 50;

Additional example: use a variation to validate behavior and edge cases.

SELECT current_database(), current_user, now();

Production tips

Prefer explicit column lists and deterministic ordering when results feed APIs or batch jobs.
Validate plans with EXPLAIN before adding indexes, then re-check after schema changes.
Keep DDL, data backfills, and cleanups in transactions when possible to avoid partial state.
Use isolated environments for risky changes so query tuning and schema experiments stay safe.

Vela workflow tip

Test this pattern in an isolated branch database, share the result with your team, and promote only after query plans and row counts look correct.

Reference: PostgreSQL official documentation.