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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.
Sun 29 Mar 2026 | Britt van der Poel
Parameters + Calculated Fields: Building a Dynamic 12-Month Period-over-Period View
Period-over-period comparisons are valuable in many different sectors and can be used to extract important insights, so knowing how to calculate them is crucial
Fri 27 Mar 2026 | Charles Yi
Using dbt's Discovery API to Build in Redundancies and Automate Maintenance
Since the turn of the new year, I've been helping a client onboard dbt and migrate 200+ models into dbt from Snowflake.
As the number of models grew, I needed a way to QC the models and dbt workflow. There were a couple of things I was looking for:
1.
Check for test coverage
Thu 26 Mar 2026 | Robin Jones
Two Methods for Larger URL Filter Parsing in Tableau Server
Ever had a Tableau URL action fail because you selected too many filters? To find the breaking point, using the Superstore dataset, I pushed the URL action to
Wed 25 Mar 2026 | Harry Singler
Download Tool in Alteryx: Web Scraping (2/2)
My introduction to web scraping in Alteryx
After learning how to download APIs, we moved on to another function in Alteryx that the download tool allows you to do: web scraping
Thu 26 Mar 2026 | Peter Gamble-Beresford
What did it take to get into DSDE12?
I'm very pleased to welcome DSDE12! That'll be the 8th Cohort I'll be overseeing here in Hamburg as they journey through our intense but rewarding 4-months of training known as The Data School
Wed 25 Mar 2026 | Vivek Patel
Weighted Averages Explained
One concept I always struggled to fully understand was weighted averages. It’s one of those topics people often say is “obvious,” but it never really clicked for me at first.
I realized I didn’t just want to know how to calculate it, I needed to truly understand why it works
Thu 26 Mar 2026 | Adrienne Zhang
How to Calculate the Distance between Points on a Tableau Map
When working with maps in Tableau, you may find yourself wanting to calculate the distances between locations. Tableau makes it straightforward to do this, provided that you have the latitude and longitude of all the points.
In this example, we’ll look at flight routes across the U.S
Thu 26 Mar 2026 | Bethany Haysom
Dashboard Rework Part 3: Cleaning in Tableau Prep
I have been reworking a dashboard that I first created before I started at The Data School. It was my first ever use of Tableau and looked at house building in the UK between 1949 and 2025.
Continuing with this project, I now needed to clean the original data using Tableau Prep
Tue 24 Mar 2026 | Oliver Furtak
Presenta(No)tion
The Presentation Panic
Do you know the feeling? You’ve documented your project in Notion perfectly – clean, organized, and detailed. Of course you did! ;-)
But then, "suddenly," that presentation deadline appears out of nowhere
Mon 23 Mar 2026 | Le Luu
SQL Optimization with Indexes
In my previous blog, I discussed the SQL query execution order and shared some tips to improve performance (link). However, when working with large datasets or complex queries, those optimizations are sometimes not enough
Tue 24 Mar 2026 | Jacob Aronson
A New Take on Word Clouds: Word Pyramids
Word clouds are a classic chart type used to quickly summarize the words used in a body of text. In a word cloud, a word's size represents its frequency in the original text, with more common words being displayed larger so that they are emphasized
Tue 24 Mar 2026 | Harry Singler
Download Tool in Alteryx: APIs (1/2)
Last week we had our introduction to APIs in Alteryx. An API is a way of requesting data from a website or service in a structured format, in this case using the Star Wars API (https://swapi.info/) to pull in data on characters from the franchise
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