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
Alteryx
Partner of the Year
EMEA
Tableau
Community Impact 2024
EMEA ESMB
DataIQ
Data for Good Champion
Finalist
DataIQ
Best Data Academy or Skills Development
Finalist
Alteryx
Partner of the Year
Europe
DataIQ
Data for Good Champion
Champion
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.
Thu 19 Mar 2026 | Aaron Holstein
CTEs
What are they?
CTE stands for Common Table Expression. Common Table Expressions are temporary data objects in SQL which present the result set of a defined query. CTEs can be referenced in other queries and exist only in the context of the query which defines them
Wed 18 Mar 2026 | Shabnam Dost
Der Blick von oben: Wie du Tableau-Dashboards intuitiv anordnest...
Warum ist das Layout eines Tableau-Dashboards so wichtig...?
1. Horizontal vs. Vertikal Container Anordung, Best Practice und Besonderheiten:
Merkmal
Horizontal Container
Vertikaler Container
Anordnung
Nebeneinander
(links nach rechts à so wie das menschliche Auge liest
Mon 16 Mar 2026 | Francesca Plaskett
Back to Basics: Joining in Tableau Prep, Alteryx and Power Query
Discover how to join in Alteryx, Tableau Prep and Power Query, and the differences between the platforms.
Mon 16 Mar 2026 | Sharon Orazulike
NHS Prescription Dataset Archives 1: Power Query
Cleaning the data
First, pick a dataset set from one of the numerous choices on the NHS website: https://www.nhsbsa.nhs.uk/prescription-data
BE WARNED!
These datasets have millions of rows, so, I would suggest only picking one month of data and working on that
Thu 12 Mar 2026 | Oscar Kriebel
Alteryx or Prep: How do they compare?
In week six at the Data School, we started covering Alteryx for the first time. Alteryx is another data preparation software that is older than Tableau Prep
Thu 12 Mar 2026 | Martin Regan
Baseball Analytics in Python: Part 4
Welcome back! In part 4 of my blog about analysing baseball data in Python, we'll be focusing on pitchers. We'll be re-using a lot of the code we wrote last week to get hitting statistics, and applying it to find good value pitchers for our fantasy baseball team
Tue 17 Mar 2026 | Arushi Pant
The difference between Dimension, measures, Continuous and Discrete.
The differences between these four terms can be hard to confusing. I hope these visuals help convey the differences between them and what each of these terms means.
Tue 17 Mar 2026 | George Chachkes
Creating Custom Tables in Tableau
Tables in Tableau are easy to create, but much harder to customize. In this blog, I’ll walk through how to build custom tables with icons, layered text, adjustable fonts and sizes, and even charts embedded directly within the table
Tue 17 Mar 2026 | Adrienne Zhang
Creating Percentile Bands in Tableau
Percentile bands can help add more depth to a simple line chart. They show typical ranges, variability, and extremes all at once.
Last year I completed a Workout Wednesday challenge by Sean Miller focused on visualizing percentile bands in Tableau
Tue 17 Mar 2026 | Jacob Aronson
Tactfully Touring The Tableau Toolbar
Most of my Tableau education happened on a need-to-know basis. If I wanted to make something happen in my dashboard, I researched it, read a few blogs, then implemented it and went on with my process
Tue 17 Mar 2026 | George Chachkes
Aggregation in Alteryx
Aggregation is one of the most important steps in drawing insights from your data. It allows you to turn raw records into meaningful metrics and start answering real business questions
Tue 17 Mar 2026 | Jacob Aronson
What Even is Alteryx? A Friendly Introduction to one of the Data School's Lesser Publicized Specialties
What is Alteryx?
When I was applying to the Data School, I learned everything there was to know about Tableau. I read blogs, watched videos, and built anything and everything that I could conceive of using the free Tableau Public Desktop subscription that is available to anybody (https://www
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