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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
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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.
Wed 17 Sep 2025 | Anastassia Hitt
What Are Table Calculations? A Closer Look at WINDOW_MAX() & WINDOW_MIN()
In Tableau, window functions are a special category of table calculations that operate across a range of rows (a "window") in your visualization. Instead of calculating values for just one row at a time, they look across multiple rows and return a single aggregated result for that defined scope
Tue 16 Sep 2025 | Amy Afriyie
Refresher Week Day 2 - SQL Stump
Day two of Refresher Week, and our focus today was SQL. I'll admit it's been a month since I last did any SQL, but I was hopeful I could pull through the session...this was the case until I hit a roadblock!
We spent the day working through the leetcode SQL exercises - you can have a go here
Tue 16 Sep 2025 | Ramin Derakhshesh
Fixing Nulls That Aren’t Missing Data
When preparing data for analysis, you may encounter tables where some (key) columns contain many null values. At first glance, it looks like important information is missing. But often, these “nulls” are not missing data
Tue 16 Sep 2025 | Mariia Pushkarova
How to Add a Diagram to a Tooltip in Tableau
Today I’ll also show you how to add a diagram to a tooltip in Tableau. It’s just as easy as in Power BI.
First, create your main diagram and the sheet that you want to use as a tooltip
Tue 16 Sep 2025 | Mariia Pushkarova
How to Add a Diagram to a Tooltip in Power BI
Today I want to share with you how to insert a diagram into a tooltip in Power BI. It’s actually very easy to do.
First, we create our main page with the dashboard, and then a second page that we want to use as a tooltip
Tue 16 Sep 2025 | Marc-Anthony Tucker
Alteryx Data Connection Manager (DCM): a Break from Credential Chaos
If you’ve spent more than a few hours dealing with credentials when building workflows in Alteryx, this feature is for you.
Mon 15 Sep 2025 | Mandy Wan
Refresher Week Project (Part 1): The Dark Knight Rises
Today was the first day of Refresher week for DS52 (how time flies!!and ) our first challenge was to work on a personal project that we will present on Friday.
I decided to work on a dashboard focused on The Batman (2022) due to my personal interest in the franchise
Mon 15 Sep 2025 | Joseph Darton
Visualising xG (The Plan)
Expected goals (xG) is a huge talking point in the footballing world with many avid football fans using it as a key metric of performance. On X (Twitter), there is an account with half a million followers called the xGPhilosophy
Mon 15 Sep 2025 | Amy Afriyie
Refresher Week Day 1 - Personal Project Initial Plan
If you have had the chance to read a bit about me in my bio (you can check my bio here if not), you would know that outside of work I am a director of an events company alongside two of my friends from university
Mon 15 Sep 2025 | Elizabeth Archer
Personal Project Plan: Bathing Water Quality
It is week 16 of my training at The Data School, the time has flown by and I am now a couple weeks away from finishing training! To utilise and expand on the many skills I have learnt in the past few months, I have started to work on a personal project
Mon 15 Sep 2025 | Younes Ghouini
Project Blog Part 2: Bringing Penguins to Life in Tableau (Visualising the data)
If you have already read Part 1 of the Project Blog, you will know we have now reached the exciting stage: visualising the data.
If not, pause here and go back. You will not want to skip it. That is the foundation of everything and the crucial step where the magic begins.
Now comes the big reveal
Mon 15 Sep 2025 | Younes Ghouini
Project Blog Part 1: Bringing Penguins to Life in Tableau (Getting the data)
Penguins have always been my favourite animal. There’s something about their clumsy waddle and sleek dives that makes them both hilarious and fascinating. So, for my latest personal project, I thought: why not bring penguins to life inside Tableau?
The idea is simple but ambitious
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