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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
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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 12 Oct 2026 | Tyler McKillop
Using Codegen in dbt to Save Time Writing SQL and YAML
When working with dbt, I found that a lot of time can be spent writing repetitive code, particularly when creating source definitions, staging models and YAML files
Fri 20 Feb 2026 | Claudina Mukangabo
What Profit Margins Won’t Tell You About Your Business
When analysing business performance, it’s easy to default to the same two metrics: sales and profit margins. They’re familiar, easy to track and provide a quick indication of how things are going.
But on their own, they can create a misleading picture
Sun 11 Oct 2026 | Dan Booth
Accessing API's
What is an API?
An API (Application Programming Interface) is a controlled way to access and exchange data with a system. APIs allow data to be shared without giving a user full access to the underlying database, which helps keep data secure, consistent and easier to use
Mon 05 Oct 2026 | Rahim Afsana
The ALL or Nothing Dilemma: Understanding ALL vs ALLSELECTED in Power BI
Ever built a calculation that changes when someone clicks a slicer? Sometimes, the challenge isn't the calculation itself, but understanding what your denominator includes.
In Power BI, two useful DAX functions for this are ALL and ALLSELECTED
Fri 09 Oct 2026 | Holly Phillips
ALL vs ALLSELECTED in DAX (PowerBI)
Knowing when to use ALL and ALLSELECTED in DAX calculations can be very confusing, but really important in getting the correct numbers in the correct places.
ALL:
ALL ignores all filters applied to a table or column, regardless of where they came from (e.g
Mon 07 Sep 2026 | Holly Phillips
How to create a data prep plan
One of the first things you will need to do when working with data is clean it
Thu 08 Oct 2026 | Mel Niere
What did it take to get into DSNY14?
Meet the eight newest members of Cohort 14 at The Data School New York!
Bringing together a diverse group of emerging data talent, Cohort 14 represents a wide range of backgrounds, experiences, and perspectives
Thu 08 Oct 2026 | Melissa Osorio
Advanced Tableau Server and Tableau Cloud Differences Pt II
This blog is the second part of my previous blog, and therefore it will not include basic descriptions of what Tableau Server and Tableau Cloud are, but will instead go straight into the differences between them
Wed 07 Oct 2026 | Ken Ueda Burgess
Making Pareto Charts in Tableau
Pareto Charts are a useful upgrade to the regular bar chart.
They excel at displaying each item's share of the total, showing high-impact items, and highlighting diminishing returns
Tue 06 Oct 2026 | Mel Niere
What did it take to get into DSNY13?
Meet the newest members of Cohort 13 at The Data School New York.
This cohort brings together six emerging data professionals with a range of skills, perspectives, and approaches to working with data
Mon 05 Oct 2026 | Skyla Patterson
How I made a Dendrogram Chart in Tableau
In this blog I'll be walking through how I made a dendrogram using birth and death count data from the CDC.
What is a Dendrogram Chart?
Also known as a tree chart, this graph is useful for representing hierarchical data and clustering results
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