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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 22 Apr 2026 | Martin Regan
SQL Order of Execution
When you first start writing SQL, it feels pretty straightforward. You write a SELECT, point it at a table with FROM, maybe filter it with WHERE, and you’re off.
But once you start adding aggregations, grouping, and filtering on those aggregations, things can get confusing quickly
Thu 16 Apr 2026 | Oscar Kriebel
Is This Your Card?: Using Apps in Alteryx
As a follow-up to a previous blog post of mine on APIs in Alteryx, this one will be covering how a workflow in Alteryx can be transformed to be interactive to the user by making it into an app. Here we'll be working with the Scryfall API again, which was previously used to return a random card
Wed 15 Apr 2026 | Lorna Brown
DS55 Dashboard Week Day 1 - Accessible London
Another 4 months finished and we have another dashboard week.
Dashboard week signifies the end of training and is also fun week as a coach as they get to watch their cohort under pressure
Tue 21 Apr 2026 | Sharon Orazulike
Making a Control Chart in Tableau
Lets starts off by making a simple chart showing sales by year and quarter and broken down by category.
We need an average line. We can drag one from the analytics pane but instead we are going to make our own table calculation. To do this we need a window calculation
Sun 26 Apr 2026 | Arushi Pant
Tableau Prep VS R Series Entry 2 - Week 7 Challenge
Round 2!
This Week's Challenge was around Valentine's Day gift suggestions, depending on how many Valentine's Days they have spent together!
Here is a Link to the Challenge: https://preppindata.blogspot.com/2024/02/2024-week-7-valentines-day
Tue 21 Apr 2026 | Sharon Orazulike
How to Build a Hex Map in Tableau
So, you want to make a visualisation of the United States but you don't want to make a classic map? Let me introduce you to world of hex maps.
To start, we need to download a US shapefile or any shapefile of any country you want to visualise
Fri 24 Apr 2026 | Jacob Aronson
Identifying Seasonal Cycles Using Auto-Correlation Functions (ACFs) in Tableau
Seasonal trends are an integral part of time series analysis, helping analysts model and forecast temporal trends. Sometimes these cyclic trends are easily identifiable; retail sales spike during the holiday season, ice cream sales peak during the summer months
Fri 24 Apr 2026 | Tomo Mensendiek
Tableau Heatmap: Move Row Labels to the Bottom of the Chart
This blog is based on Andrew Ball's blog about Moving table headers to the bottom (Making a table look like a chart), adjusted for heatmaps. You can check out the original blog here.
This is a trick to move the field labels on rows to the bottom of the chart
Tue 21 Apr 2026 | Jules Claeys
Cortex 1.0.1 - Semantic Views
When I think about incorporating AI within the Data world, one of my main concern is the ability of the LLM to understand what data to look at, what it means, and anything relating to business context
Tue 21 Apr 2026 | Laura Brylka
Data Modeling in Tableau vs. Power BI
During our recent training, something that I found particularly confusing were the differences in data modeling between Tableau and PowerBI . I created this blogpost to help others who might have similar struggles.
The nomenclature
The first hurdle is the difference in nomenclature
Thu 23 Apr 2026 | Adrienne Zhang
Why asterisks appear when blending data sources in Tableau (and how to remove them!)
If you’ve blended data sources before in Tableau, you’ve probably encountered a situation where an asterisk appears in one of your columns.
A common reason this occurs is that each mark in the primary data source corresponds to more than one matching value in the secondary source
Thu 23 Apr 2026 | Ellie Kershenbaum
Explaining Small Multiples in Tableau
Recently, I wrote a blog (https://www.thedataschool.co.uk/ellie-kershenbaum/small-multiples-chart-trellis/) in which I explained how to create a Trellis (or small multiples) chart in Tableau. In that post, I introduced two key table calculations required to build the layout
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