SeaQL Saturday 2026
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The Postgres Meetup group of the Netherlands
With summer just around the corner, we are happy to invite you to the Summer Edition of the PostgreSQL User Group NL Meetup on June 25th 2026 in Amsterdam.
This time we have been invited by Databricks to host the event in their Amsterdam headquarters. We are very appreciative of this gesture and we like to thank them for supporting the PostgreSQL community with the venue and the hospitality.
On the agenda we have two PostgreSQL experts in their field. First up is an alumni presenter of the PostgreSQL User Group, Matthias van der Meent, who will be taking us on a deep dive into one of the better known index types: GiST. Next on the program is Bart Orbons, who will centre his presentation around grouping.
As usual we have some space in the program reserved for anyone who wants to do a lightning talk. Please contact us or through a personal message on meetup.com.
We are very grateful for the contributions of both presenters as well as our host, to make this all possible for the PostgreSQL community in the Netherlands.
We hope to meet many of you at the meetup, a moment where PostgreSQL users can connect, share knowledge, and discuss the latest developments in the PostgreSQL ecosystem.
We look forward to a great meetup!
Feike Steenbergen
Gerard Zuidweg
Meetup program
17:30 – 18:25 Welcome, Beer & Bites
18:25 – 18:30 Opening by Gerard Zuidweg, OptimaData
18:30 – 19:10 GiST indexes: An analysis – Matthias van der Meent
Break
19:15 – 19:55 ‘Grouping, the way you want it’ – Bart Orbons
19:55 – 20:00 Lightning talks
20:00 – 20:30 Wrap up and drinks
Talks
GiST indexes: An analysis – Matthias van der Meent (Databricks)
Abstract: PostgreSQL has various index types, each supporting different query patterns and behaviours. In this talk, Matthias will go over one of the better known index types: GiST — how and where it is used, how it works, its strengths, its weaknesses, and some possible improvements.
About Matthias: Matthias van der Meent is a PostgreSQL hacker and contributor with over 5 years of contributions to the project. His focus is mostly on subsystem performance, indexing, and resource usage.
‘Grouping, the way you want it’ – Bart Orbons (Z-Cert)
Abstract: This talk dives into PostgreSQL’s advanced grouping features, showing how to go beyond a plain GROUP BY to aggregate data exactly the way you need it. Expect practical examples that make complex reporting queries simpler and more powerful.
About Bart: PostgreSQL user and enthusiast. Started using PostgreSQL in 2000 and has not stopped since — having worked before with Sybase and Oracle, but not anymore. Until four years ago, Bart worked at XS4ALL Internet as a technical software architect focused on database and software modelling, until the company was folded into its parent organisation. He then helped migrate the customer base into their systems before moving on to his current role at Z-CERT, where he helps set up company administration and systems. A regular at pgconf.eu, this talk is part of a series Bart originally created for colleagues at XS4ALL to improve their SQL skills and introduce newer features of the SQL language.
Lightning Talks
What are Lightning Talks?
A Lightning talk is a short presentation given at a conference or meetup. Unlike other presentations, Lightning Talks last only a few minutes and several are usually given in a short time slot by different speakers. Everyone has the opportunity to give their views, share a short topic or ask for input from the audience in the span of 1 slot.
During the PostgreSQL Usergroup NL meetups, through the Lightning Talks, we provide a low-threshold stage for participants to share their experience and knowledge.
Would you like to submit a Lighting Talk, do you have a short topic, would you like to share something within the PostgreSQL domain or what it touches? Send us an email with your suggestion, your topic, or just your name requesting a time slot and we will schedule you into the Lightning Talks! You can also put your name on the list on the night itself!
Location
De meetup will be held at the Dutch office of DataBricks in Amsterdam:
The adress is:
Barbara Strozzilaan 350 (2e floor)
1083 HN Amsterdam
Netherlands
How to get there:
By car:
Ring A10 afrit s109. Parking Q-park Eurocenter, Barbara Strozzilaan 342.
Public transport:
Metro and train station Amsterdam RAI. Then a little walk to Eurocenter.
Signup Meetup
Once all details are confirmed, the button below will be activated to register. A notification will also be sent out via Meetup.com.
Feel free to register for this Dutch PostgreSQL community meetup. Thanks to the organization by OptimaData and the hospitality of VandeBron for this occasion, this is a free event that includes food and drinks. You can register via the link above on our meetup page on meetup.com. If you don’t have a meetup.com account yet or are not yet a member of the PostgreSQL Usergroup NL, sign up for free and register for the meetup.
