Hannes Mühleisen
@hannes.muehleisen.org
📤 6544
📥 1006
📝 131
I like databases and boats. Co-creator of
@duckdb.org
, Co-Founder and CEO DuckDB Labs.
reposted by
Hannes Mühleisen
DuckDB
1 day ago
🇳🇱🌷🚲 DuckDB now speaks Dutch! Load the EendDB community extension and start writing your queries in het Nederlands:
duckdb.org/2026/04/01/d...
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Hannes Mühleisen
DuckDB
2 days ago
🇳🇱 DuckCon returns to the Netherlands! We'll host our next edition on June 24 in Amsterdam. We are looking forward to meeting the DuckDB community in our home town's Royal Tropical Institute for an afternoon of talks and discussions. Please submit your talk proposals and register!
duckcon.org
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Hannes Mühleisen
Christopher Grainger
9 days ago
That DuckDB extension I was working on landed in community extensions today! I'm pretty excited about it -- prefiltered ACORN-1 HNSW approx nearest neighbours in
#DuckDB
. Even pgvector does postfiltering, for example. INSTALL hnsw_acorn FROM community; LOAD hnsw_acorn;
github.com/duckdb/commu...
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Add hnsw_acorn: filtered HNSW vector search with ACORN-1 by cigrainger · Pull Request #1573 · duckdb/community-extensions
Summary Adds the hnsw_acorn extension — a fork of duckdb-vss that adds filtered HNSW vector search using the ACORN-1 algorithm. The upstream vss extension applies WHERE clauses after the HNSW index...
https://github.com/duckdb/community-extensions/pull/1573#issuecomment-4122080159
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Hannes Mühleisen
Christopher Grainger
9 days ago
Hey
#ElixirLang
folks! Here's a little something I've been working on. I'd love some early stage feedback.
dux.now
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Dux: Distributed DuckDB-native DataFrames for Elixir
dplyr-style verb API backed by DuckDB. Lazy pipelines compile to SQL. Distributed execution across the BEAM. Graph analytics, cross-source joins, Nx interop.
https://dux.now/
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DuckDB
10 days ago
📈 Today, we are releasing DuckDB version 1.5.1, a patch release with bug fixes, performance improvements and support for the Lance lakehouse format. ➡️
duckdb.org/2026/03/23/a...
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Hannes Mühleisen
DuckDB
13 days ago
We're excited to announce duckdb-skills, a DuckDB plugin for Claude Code! We think the embedded nature of DuckDB makes it a perfect companion for Claude in your local workflows. Check out the repository at
github.com/duckdb/duckd...
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GitHub - duckdb/duckdb-skills
Contribute to duckdb/duckdb-skills development by creating an account on GitHub.
https://github.com/duckdb/duckdb-skills
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Hannes Mühleisen
DuckDB
17 days ago
👀 DuckDB spotted in this year's NVIDIA GTC keynote:
youtu.be/jw_o0xr8MWU?...
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Hannes Mühleisen
DuckDB
20 days ago
5️⃣ Save the date: on 05. 05., we'll hold the first DuckCon in the APAC region. 5️⃣ Singapore is the 5th city where we host the conference after Brussels, Amsterdam, San Francisco and Seattle. 5️⃣ Most importantly: you have 5 days to submit your talk proposals! ➡️
duckdb.org/events/2026/...
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Hannes Mühleisen
DuckDB
21 days ago
🍻 We are hosting a pub session during NVIDIA GTC! If you are in San Jose next Tuesday, sign up to have a beer with DuckDB's co-creator Hannes Mühleisen and members of the DuckDB community. 🎟️
luma.com/d0x8pwu0
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DuckDB Pub Session in San Jose · Luma
We are hosting a pub session during Nvidia GTC, where you can chat with DuckDB's co-creator, Hannes Mühleisen and connect with members of the DuckDB community.
https://luma.com/d0x8pwu0
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Hannes Mühleisen
DuckDB
24 days ago
We released DuckDB v1.5! This release comes with a “friendly CLI” client, a new (opt-in) PEG parser, support for VARIANT types and many lakehouse features. It also ships a new network stack, a reworked geospatial extension, Azure writes and an ODBC scanner. Read more at
duckdb.org/2026/03/09/a...
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Hannes Mühleisen
DuckDB
about 1 month ago
🏗️ The DuckDB team is working hard on delivering DuckDB v1.5. 🌃 While the official release is next week, you can already give it a quick test using the nightly builds available at
duckdb.org/install/prev...
If you encounter any issues, let us know! 🐛💬
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DuckDB Preview (Nightly) Installation
DuckDB preview installation page
https://duckdb.org/install/preview
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Hannes Mühleisen
DuckDB
about 1 month ago
🦆 ↔️ 🦀 DuckDB Labs is looking for a Rust engineer to join our team in Amsterdam. 📝 See the details and application page at
duckdblabs.com/jobs/rust_en...
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Rust Engineer
DuckDB Labs provides services around the DuckDB in-process OLAP data management system directly from its main developers.
https://duckdblabs.com/jobs/rust_engineer
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Hannes Mühleisen
Brian Dill
about 2 months ago
@hannes.muehleisen.org
I LOOOOVE DuckDB so much that I am presenting a "DuckDB 101" session at
datatuneconf.com
on March 7
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DataTune - Data Community Conference - Nashville 2026
DataTune is Nashville’s community-driven conference for data professionals, leaders, and innovators. Join us March 6 – 7, 2026, to learn, connect, and explore the future of AI, engineering, and analyt...
https://datatuneconf.com/
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Hannes Mühleisen
about 2 months ago
Tired of digging through gov databases for H1B wage data? I built OpenH1B.org to make it easy. 500k records, DuckDB/Parquet tech, 200+ QPS speed. Search by ZIP for official DOL levels.
https://openh1b.org
#h1b #career #data #python
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I built a tool to find your H1B Wage Level by ZIP code (OpenH1B.org)
Discover official DOL Wage Levels (I-IV) by ZIP code with OpenH1B.org. A faster, cleaner way to navigate the 2025-2026 H1B lottery season.
https://openh1b.org/blog/2026-02-11-h1b-wage-level-by-zip-code/
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Hannes Mühleisen
Peter Boncz
about 2 months ago
DuckDB was added to the wall of fame of CWI, next to Dijkstra’s shortest path algorithm, the Atlantic Crossing of the Internet & the creation of Python On the occasion of our 80th (really!) bday Congrats to
@hannes.muehleisen.org
&
@markraasveldt.bsky.social
@duckdb.org
@cwi-amsterdam.bsky.social
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Hannes Mühleisen
hrbrmstr 🇺🇦 🇬🇱 🇨🇦
about 2 months ago
holy moly! great caesar's ghost! The DuckDB C extension template makes writing DuckDB extensions SO MUCH EASIER/FASTER. /me *is about to run amok making extensions*
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Hannes Mühleisen
Hadley Wickham
2 months ago
I love this idea:
duckdb.org/community_ex...
. It translates dplyr syntax _inside_ of duckdb so you can mix it with regular SQL
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dplyr
DuckDB Community Extensions R dplyr pipeline syntax support for DuckDB - transpiles dplyr verbs to SQL
https://duckdb.org/community_extensions/extensions/dplyr
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Hannes Mühleisen
Jenna Jordan
2 months ago
I’m absolutely delighted to see
@hannes.muehleisen.org
talk for the first time in person. He is somehow using duckdb for his slides (of course), and talking about the joy of sql… if properly implemented.
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Hannes Mühleisen
DuckDB
3 months ago
🖥️ In today's “What's on your desk?” episode,
@hannes.muehleisen.org
tests the MOREFINE M700S computer. This computer ships with a Loongson processor that comes with its own CPU architecture. Despite this, DuckDB runs on it quite easily. See the details in the blog post. ➡️
duckdb.org/2026/01/06/d...
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Hannes Mühleisen
Totoro
3 months ago
Yeay!! I wrote a very opinionated list of tips for working with DuckDB in R! Hope others find it useful.
github.com/eriksquires/...
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GitHub - eriksquires/DuckDB-With-R: Documentation Repo for tips on using DuckDB with R
Documentation Repo for tips on using DuckDB with R - eriksquires/DuckDB-With-R
https://github.com/eriksquires/DuckDB-With-R
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Hannes Mühleisen
Josh Persi
3 months ago
Hey folks! I built a Canadian trade database to practice what I'm learning about DuckDB. The database includes all Canadian imports and exports from 1988 to present as per Statistics Canada. Here's a blog post I wrote with more details:
joshpersi.github.io/blog/posts/0...
#rstats
#duckdb
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A Canadian trade database built with DuckDB – Josh Persi
https://joshpersi.github.io/blog/posts/03_duckdb_trade_database/
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Hannes Mühleisen
DuckDB
4 months ago
You can now query Iceberg catalogs with DuckDB – from the convenience of your browser. In our latest blog post, we break down how DuckDB's WebAssembly client makes this possible with zero setup and showcase it in action using Amazon S3 Tables. 👉
duckdb.org/2025/12/16/i...
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Hannes Mühleisen
Markus Winand
4 months ago
Adieu Apache Derby, Welcome DuckDB
modern-sql.com/blog/2025-12...
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DuckDB Coverage
Apache Derby is retired, ModernSQL now covers DuckDB instead
https://modern-sql.com/blog/2025-12/derby-duckdb
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Hannes Mühleisen
Carlo Piovesan
4 months ago
If you are into Iceberg or DuckDB, this is a major step: you can access existing Iceberg datasets, while they are appended on or updated by other users (possibly they can also be clicking buttons in a browser). This has been very fun, was looking forward to be able to properly share, thanks flock!
add a skeleton here at some point
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Found this fun bug in
#Google
Maps. The Austin airport jumps away and back quite far just by zooming...
4 months ago
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Hannes Mühleisen
DuckDB
4 months ago
In seven weeks, we will host the first DuckDB Developer Meeting in Amsterdam. We have four exciting talks lined up on building extensions in DuckDB, encryption in DuckDB, DuckPL and GizmoEdge. For more details and the registration links, please head to
duckdb.org/events/2026/...
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Hannes Mühleisen
DuckDB
4 months ago
We are happy to announce DuckDB v1.4.3 LTS, our latest patch release. Along with bugfixes, this release ships native extensions and Python support for Windows ARM64. Head to
duckdb.org/2025/12/09/a...
for the announcement blog post and installation instructions.
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Hannes Mühleisen
Kyle Walker
4 months ago
This is the most exciting time ever to be working in data, and I'm not talking about AI. 3 years ago, I wrote a database-centric guide in my book for analyzing the full 92 million record 1910 Census. Now, with
#rstats
and @duckdb? Analyze those 92 million rows in seconds.
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Hannes Mühleisen
Markus Winand
4 months ago
modern-sql.com
now covers DuckDB.
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Modern SQL: A lot has changed since SQL-92
SQL has evolved. Beyond the relational model. Discover it now.
https://modern-sql.com/
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Hannes Mühleisen
DuckDB
4 months ago
In DuckDB v1.4.2, we shipped a number of features and improvements to the DuckDB-Iceberg extension: insert, update, and delete statements are all supported now. Read Tom Ebergen's new article on these features at
duckdb.org/2025/11/28/i...
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Hannes Mühleisen
DuckDB
4 months ago
DuckDB v1.4 introduced the much-requested feature of database encryption. In our new blog post,
@ccfelius.bsky.social
and
@hannes.muehleisen.org
explain how the encryption works under the hood:
duckdb.org/2025/11/19/e...
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Hannes Mühleisen
Qiusheng Wu
5 months ago
I’m thrilled to share that my new book (Spatial Data Management with DuckDB) is now published! 🎉 At 430 pages, this book provides a practical, hands-on guide to scalable geospatial analytics and visualization using DuckDB. All code examples are open-source and freely available on GitHub.
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Hannes Mühleisen
DuckDB
5 months ago
🚀 We released DuckDB v1.4.2, the second patch release of our LTS edition. 🔎 We are shipping new Iceberg features, improved logger/profiler integration and several bugfixes. The new DuckDB version can also read and write Vortex files. 📖 For more details, read
duckdb.org/2025/11/12/a...
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Hannes Mühleisen
Ben Schneider
5 months ago
This profile in ‘Significance’ on DuckDB co-founder Hannes Mühleisen is quite interesting, and has helpful insights about data quality and the changing meaning of “big data.” Also some good professional advice in here for statisticians.
academic.oup.com/jrssig/artic...
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Is big data dead?
Abstract. Data, ducks and statistics – Sandra Alba gathers dispatches from Amsterdam and Auckland
https://academic.oup.com/jrssig/article-abstract/22/6-7/55/8275182
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Hannes Mühleisen
Development Seed
5 months ago
We took Canada’s Spatial Access Measures dataset (big, clunky CSVs) → turned it into a single GeoParquet file. Add DuckDB-WASM +
deck.gl
& you get - instant queries - smooth maps - no backend Public data, but actually usable.
developmentseed.org/blog/2025-10...
@saadiqmohiuddin.bsky.social
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Hannes Mühleisen
Marco Slot
5 months ago
pg_lake just went open source! (Apache 2.0) pg_lake is a set of extensions (from Crunchy Data Warehouse) that add comprehensive Iceberg support and data lake access to Postgres, with
@duckdb.org
transparently integrated into the query engine. Announcement blog:
www.snowflake.com/en/engineeri...
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Hannes Mühleisen
DuckDB
5 months ago
The PyData Amsterdam 2025 keynote “Minus Three Tier: Data Architecture Turned Upside Down” by
@hannes.muehleisen.org
is out now.
www.youtube.com/watch?v=DxwD...
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KEYNOTE: Hannes Mühleisen - Data Architecture Turned Upside Down | PyData Amsterdam 2025
YouTube video by PyData
https://www.youtube.com/watch?v=DxwDaoUijTc
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Hannes Mühleisen
DuckDB
5 months ago
🎞️ 𝘊𝘢𝘯 you store a movie in DuckDB? In today's blog post,
@hannes.muehleisen.org
shows how to store a movie as a table encoding the RGB codes pixel-by-pixel, and how to process it:
duckdb.org/2025/10/27/m...
Now, whether you 𝘴𝘩𝘰𝘶𝘭𝘥 store a movie in DuckDB... we'll leave that to your judgment.
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Hannes Mühleisen
DuckDB
5 months ago
📣 New blog post by
@dtenwolde.bsky.social
. 🕸️ In this post, we show how to use DuckDB and the DuckPGQ community extension to analyze financial data for fraudulent patterns with the SQL/PGQ graph syntax that's part of SQL:2023. 📖 Visit
duckdb.org/2025/10/22/d...
to read the post.
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Hannes Mühleisen
Dirk Eddelbuettel
5 months ago
duckdb-mlpack 0.0.2: mlpack is now a duckdb community extension Bringing mlpack machine learning to duckdb SQL
dirk.eddelbuettel.com/blog/2025/10...
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Hannes Mühleisen
DuckDB
5 months ago
🇫🇮 We are hosting a pub session next week during the
@helsinkidataweek.bsky.social
, where you can chat with DuckDB's co-creator,
@hannes.muehleisen.org
and have a drink with members of the DuckDB community. 🎟️ Sign up on Luma:
luma.com/s5sl9qxx
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Hannes Mühleisen
Dirk Eddelbuettel
6 months ago
ML quacks: Combining duckdb and mlpack
dirk.eddelbuettel.com/blog/2025/10...
A 'minimally viable product / demo' of extending
@duckdb.org
with
#mlpack
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Hannes Mühleisen
Torsten „Teggy“ Grust
6 months ago
I'm grateful that Jack Waudby gave me the chance to set the CTE record straight on his
@disseminatepodcast.bsky.social
. Hear us talk about what you can do with iterative queries in SQL, how efficient variants of recursion in SQL found their way into
@duckdb.org
, and how trampolines come into play.
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Hannes Mühleisen
PyLadies Amsterdam
6 months ago
Learn how to build powerful yet lightweight
#data
workflows using
#Python
,
#DuckDB
, and
#Smallpond
with Valery C. Briz,
#Pythonista
, senior
#dataengineer
on the 23rd of October in our
#online
#workshop
18:00-19:30 CEST Register here:
www.meetup.com/pyladiesams/...
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Hannes Mühleisen
DuckDB
6 months ago
🚀 We released DuckDB v1.4.1, the first bugfix release of our LTS edition. 🔎 We expect LTS users to be particularly curious about changes in the system, so we wrote up a short blog post highlighting the most important fixes and improvements.
duckdb.org/2025/10/07/a...
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Announcing DuckDB 1.4.1 LTS
Today we are releasing DuckDB 1.4.1, the first bugfix release of our LTS edition.
https://duckdb.org/2025/10/07/announcing-duckdb-141
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Hannes Mühleisen
CMU Database Group
6 months ago
Today's Future Data Systems Seminar Speaker: Jordan Tigani (
@jrdntgn.bsky.social
) will present how
@motherduck.com
supports modern workloads with DuckLake. Zoom talk open to public at 4:30pm ET. YouTube video available after:
db.cs.cmu.edu/events/futur...
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[Future Data] DuckLake: Learning from Cloud Data Warehouses to Build a Robust "Lakehouse" - Carnegie Mellon Database Group
When building scalable data systems, it is easy to focus on the... Read More +
https://db.cs.cmu.edu/events/future-data-ducklake-learning-from-cloud-data-warehouses-to-build-a-robust-lakehouse/
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Hannes Mühleisen
DuckDB
6 months ago
✨ We launched a new installation page for DuckDB! 🚀 The new page lets you install the latest stable DuckDB release with just one or two clicks. If the defaults don't fit your use case, no worries: alternative download methods remain available for many clients.
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Hannes Mühleisen
Santiago Saavedra
6 months ago
After trying
@duckdb.org
with terabytes of parquet I'm hardly going back for data exploration to anything else. Hell, I'm now spawning DuckDB for analyzing even .csv and .json files due to how ergonomic its SQL is.
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Hannes Mühleisen
DuckDB
6 months ago
We published a new deep dive by Laurens Kuiper, who recently redesigned DuckDB's sort. One data point: ordering the TPC-H SF100 lineitem table with the memory limit set to 30 GB is 3× faster in DuckDB v1.4 than in v1.3. Read more at
duckdb.org/2025/09/24/s...
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Redesigning DuckDB's Sort, Again
After four years, we've decided to redesign DuckDB's sort implementation, again. In this post, we present and evaluate the new design.
https://duckdb.org/2025/09/24/sorting-again
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Hannes Mühleisen
DuckDB
7 months ago
🚀 We released version 0.3 of the DuckLake specification and the DuckDB ducklake extension today. It includes interoperability with Iceberg, support for geometry types and more. Check the announcement blog for more details
ducklake.select/2025/09/17/d...
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