Tableau Tim 2020.2: The Tableau Data Model & Relationships HD

This is the first in a four-part series where Tim Ngwena aka ‘Tableau Tim’ looks at the key new Tableau 2020.2 features and gives you a chance to ask him questions about the new features.
We’re thrilled to introduce Tableau 2020.2! The latest Tableau update has a lot of amazing new game-changing features, but arguably the most exciting is Relationships. Tune in to hear Tim explain how Relationships fundamentally changes how you will think about data models in Tableau, and how Relationships will help you find insights in your data even faster and easier than ever before.
Links:
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- Get all the materials Tim shows here: j.mp/2YvaEot
- See Tim's 2020.2 summary videos: • What's new in New in ...
- Tim on twitter:
/ tableautim
- Tim's TH-cam channel: / @tableautim
- Bethany Lyon's TC19 talk on Relationships: tc19.tableau.c...
- Bethany Lyon's blog post on Relationships: www.tableau.co...
-Tableau Help page on Relationships: help.tableau.c...
- Tableau pre-release program: prerelease.tab...

[@lord75009]

Congratulation Tim ! I've learned a lot... you are such a good speaker/teacher !

[@matt_SurfaceOfTheSunPhx]

this is really valuable - thanks for breaking the changes down.

[@beccasmith3781]

Thank you so much for sharing this!

[@simranpalkohli7733]

Very well explained the new version :)

[@cargouvu]

Have you connected to a server using relationships? How is performance using relationships?

[@TableauTim]

its a little early to give a broad overview but I think the best way to understand this is to connect to your specific server and run the performance recorder as even he same database can perform differently in two separate companies. However broadly, id expect a few things, use extracts where you can as these are nearly always faster than live connections apart from some exceptions, poorly built workbooks will always perform slowly and lastly I think you'll notice improvements in instances where you were already doing something awkward like blending large data sets or doing a join that exploded your data then required an LOD.

[@cargouvu]

This is awesome... because I can be a Tableau learner... I'd like to be friends with you too.

[@kate52103]

Can I use relationships instead of blending heterogeneous datasources?

[@TableauTim]

you can but blending has some benefits in some use cases, especially if you'd like to refresh each data source independently.

[@joefromdc]

Statement - If we did a blend, we would be able to filter the individual data sources coming into tableau
Question: Are we able to do that same function using relations

[@theinformationlab]

Hi Joe, if you create a data source filter, this happens before the relationship is created in terms of Tableau's order of operations, so the relationship won't be able to be created with the secondary source and will therefore be filtered too. It's difficult to suggest the best approach for you without knowing your specific use case, so feel free to get in touch with us via email and we will try to help.

[@joefromdc]

@@theinformationlab thanks for ur reply. The only solution I was able to find as of yesterday was a custom sql statement.
Issue - build a report that only shows current employees with historical hours charged to a project. Had to use two different data sources.