A Reflective Blog: Coming to the end of training

The Data School experience has been an amazing way to start my working career. After studying maths for 4 years in order to gain a degree and masters I thought that my working life would be somewhat of a boring ordeal, solving problems that would only affect a very...

Alteryx Core Exam Tips

The Alteryx Core exam is a very good way to test your Alteryx skills and also learn some new information that would usually be glossed over. The exam can be registered for here and at the start of the next month you will receive an email with a link that allows you to...

Tableau QA Revision Tips

Tableau QA Exam Tips The Tableau QA Exam can be a little intimidating, but there are lots of resources out there from the community and Tableau itself to help you pass the certification. Here I will go through some of the things I found most useful in preparing for...

Running Sum and Moving Average in SQL

Using Tableau’s Superstore as the database, the SQL query: Select [Region], [Order Date], Sum([Sales]) as ‘Sales’ From superstore Group By Region, [Order Date] ; creates a table with column headers Region, Order Date and Sales, where the Sales is the...

Calculating Amount of Days from First Entry

In this blog we will use an LOD to calculate the first entry date of purchase of products in the Superstore data set and then use this LOD to calculate the running sum of sales over amount of days after the first sale. This normalises the start of selling for...