---
description: Connect DuckDB to Basin Catalog to query and manage Iceberg tables.
title: DuckDB
image: https://developers.cloudflare.com/basin-catalog/config-examples/duckdb/og.png?v=9c709b4d966a5902
---

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# DuckDB

Last updated Oct 1, 2026|Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/basin-catalog/config-examples/duckdb/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

Below is an example of using [DuckDB ↗︎](https://duckdb.org/) to connect to Basin Catalog. For more information on connecting to Basin Catalog with DuckDB, refer to [DuckDB documentation ↗︎](https://duckdb.org/docs/stable/core_extensions/iceberg/iceberg_rest_catalogs#r2-catalog).

## Prerequisites

- Sign up for a [Cloudflare account ↗︎](https://dash.cloudflare.com/sign-up/workers-and-pages).
- [Create an R2 bucket](https://developers.cloudflare.com/r2/buckets/create-buckets/) and [enable the data catalog](https://developers.cloudflare.com/basin-catalog/manage-catalogs/#enable-basin-catalog-on-a-bucket).
- [Create an R2 API token](https://developers.cloudflare.com/r2/api/tokens/) with both [R2 and data catalog permissions](https://developers.cloudflare.com/r2/api/tokens/#permissions).
- Install [DuckDB ↗︎](https://duckdb.org/docs/installation/).
  - Note: [DuckDB 1.4.0 ↗︎](https://github.com/duckdb/duckdb/releases/tag/v1.4.0) or greater is required to attach and write to [Iceberg REST Catalogs ↗︎](https://duckdb.org/docs/stable/core_extensions/iceberg/iceberg_rest_catalogs).
- Note: DuckDB [does not currently support ↗︎](https://duckdb.org/docs/stable/core_extensions/iceberg/iceberg_rest_catalogs#limitations-for-update-and-delete) `DELETE` on partitioned tables.

## Example usage

In the [DuckDB CLI ↗︎](https://duckdb.org/docs/stable/clients/cli/overview.html) (Command Line Interface), run the following commands:

```sql
-- Install the Iceberg DuckDB extension if needed, then load the extension.
INSTALL iceberg;
LOAD iceberg;

-- Install and load httpfs extension for reading/writing files over HTTP(S).
INSTALL httpfs;
LOAD httpfs;

-- Create a DuckDB secret to store Basin Catalog credentials.
CREATE SECRET r2_secret (
    TYPE ICEBERG,
    TOKEN '<token>'
);

-- Attach Basin Catalog with the following ATTACH statement.
ATTACH '<warehouse_name>' AS my_r2_catalog (
    TYPE ICEBERG,
    ENDPOINT '<catalog_uri>'
);

-- Create the default schema in the catalog and set it as the active schema.
CREATE SCHEMA my_r2_catalog.default;
USE my_r2_catalog.default;

-- Create and populate a sample Iceberg table with data.
CREATE TABLE my_iceberg_table AS SELECT a FROM range(4) t(a);

-- Show all available tables.
SHOW ALL TABLES;

-- Query the Iceberg table you just created.
SELECT * FROM my_r2_catalog.default.my_iceberg_table;
```

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