DESelect can provide you with a Demo Data package, which contains a bunch of data extensions with demo data. These can be used for demoing and training purposes. The Demo Data package has been distributed in two versions. Anyone that joined DESelect before September of 2020 should have the first version.
An overview of common queries that could be built with the Demo Data Package can be found here for the first version and here for the second version. These scenarios are great for demoing different functionalities of DESelect or testing training participants' knowledge.
Demo Data Structure
An overview of the structure of the data extensions in the Demo Data Package can be found:
Here for the first version.
Here for the second version.
How To Get The Demo Data Package
This data is installed by default when DESelect is installed. You can find it under Data Extensions (eg. in Email Studio) in a folder called DESelect Demo Data.