Build your Team
Enhancing your data team with ours
Our consultants come armed with both technical and soft skills to support you to make the most of your data.
The Data School has been paramount to our success at JLL. It has allowed us to bring in highly skilled Tableau and Alteryx consultants. It saves considerable time trying to recruit contractors as I know their skills and training are to the highest standard. Over the past 5 years my team has developed analytical insights which have generated multi million dollar savings of which a considerable amount can be attributed to the Data School consultants we have had working on projects.
Paul Chapman, Global Director of Performance Management, BI and Innovation at JLL
Emerging Partner of the Year
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EMEA
Tableau
Community Impact 2024
EMEA ESMB
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Data for Good Champion
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Alteryx
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Europe
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What our consultants are working on
We believe that sharing knowledge and expertise is key to driving innovation and growth in the data community. That's why we're excited to share our latest insights, tutorials, and industry trends with you through this blog.
Written by our team of experienced data consultants, these posts aim to solidify their own learning while giving back to the community.
Mon 28 Sep 2026 | Bianca Beingolea-Joseph
How to Filter a Donut Chart Without Highlighting the Pie Chart Underneath
If you've built a Donut Chart in Tableau before, you know that it is essentially a Pie Chart covered by a centered circle. (If you're wondering how to make a Donut Chart in Tableau you should check out this blog)
Tue 29 Sep 2026 | Ken Ueda Burgess
Queries within Queries - Common Table Expressions in SQL
In SQL, a Common Table Expression (CTE) is a useful tool that lets you combine multiple SQL queries.
More specifically, you can create a SELECT query and use its values in a second query. It's similar to creating a temporary view that you can use in a query
Tue 29 Sep 2026 | Amy Afriyie
ETL (Extract, Transform, Load) vs ELT (Extract, Load, Transform)?
What is it?
These are two slightly different processes used to create new database objects. The difference between the two processes is where data transformations take place. ETL is the traditional method or process whereas ELT is a relatively new process.
ETL
1. Extract
2. Transform
3
Fri 25 Sep 2026 | Jalil Cooper
How to Create a Cohort Chart in Tableau
During a recent client project, I had the opportunity to build a cohort chart in Tableau for the first time. Cohort charts are a unique way to visualize data because they provide the user a specific framework in which to conduct their analysis (by a sub-set aka cohort)
Mon 28 Sep 2026 | Olivia Millar
Tableau Performance Optimisation: Utilising Built-In Diagnostic Tools
If you have a dashboard you need to optimise for performance and need some help on where to begin, or if you are developing a new dashboard and know performance is a priority from the start, guessing which aspects are causing a performance bottleneck is inefficient
Mon 28 Sep 2026 | Kaori Ikarashi
DAX context: Row context and Filter context
One of the most important ideas in DAX is context.
In simple terms, context is the environment DAX uses to decide which data to look at when calculating a result.
The same DAX measure can return different results depending on where and how it is evaluated
Sun 27 Sep 2026 | Alexander Mackay-Smith
Building a Time Planner in Tableau (Gantt Chart)
After starting at the Data School, one of the first things I noticed was how much I had to keep track of!
There are plenty of great organisation tools out there, but as I am already on a Tableau learning journey, I thought I would attempt to build a planning tool in Tableau
Sun 27 Sep 2026 | Ismail Abdillahi
The part of LODs that confused me and how it finally clicked
Week 2 was mostly Tableau, and the thing that held me up longest was Level of Detail expressions. Not the syntax. The syntax is short
Sun 27 Sep 2026 | Melissa Osorio
Cube Data Sources.
Type of data source in which hierarchies and aggregations have already been created by the cubes designer in advance.
They’re powerful as they can return information often quicker than relational data sources
Fri 25 Sep 2026 | Skyla Patterson
Connect to an API with me in Alteryx: Stardew Valley Wiki
In this blog I'll be walking through how I used Alteryx to connect to Stardew Valley data, a popular farm simulation game. The free API can be found at: https://www.stardewvalleywiki.net/developers. My end goal is to get data on the villagers in the game
Fri 25 Sep 2026 | Holly Phillips
What's a Null?
A null value isn't just zero or empty text, they represent missing or unknown data. Not handling them correctly can lead to inaccurate reporting or confusing dashboards.
There are 2 types of nulls in Tableau:
1
Fri 25 Sep 2026 | Olivia Millar
Tableau Performance Optimisation: Live vs. Extract Connections
When designing a Tableau workbook, simply choosing the right connection type between Live and Extract is one of the simplest but most effective changes you can implement
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