Donna + DataViz

A space to share information on all things Tableau and Data Viz that will be of use to me for future reference, and maybe a helpful guide for you too!

  • Can you format your numbers to the right scale?

    September 18, 2026 by

    The main focus of the challenge I set this week, was to provide a reference example for the undocumented custom number format option of ‘scale’. which automagically determines whether the number should be formatted to millions (M) or thousands (k) etc. This revelation was shared via a blog post by Roxanne Agerone To make the… Read more

  • Let’s tell a story with map layers!

    September 11, 2026 by

    For #WOW2026 Week36, Sean challenged us to use map layers to recreate the famous John Snow cholera map from 1854. He provided 3 csv data sets that I downloaded. Despite there being 3 data sets, and only 1 sheet to build, this challenge did not require any data modelling to combine the data sets in… Read more

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