for now, you can expect to see questions about data tables on the CSA exam.
The prerequisite courses for CSA are SAE1 and 2. Both of these courses are at 7.1.6, and understanding data tables is a testable objective.
And, fwiw, I see a lot ot chatter in these forums about data tables going away in 7.1.7
This is not entirely true. What's gone is the concept of the Data Table wizard. The name was changed to Local data storage, and working with these local records is a whole lot easier; you access local data storage from the data type in the Data Explorer. Click the name of the data type in the Data Explorer, then select the Records tab.
REMEMBER: this view of the data type is in 7.1.7. Do not expect to see this in 7.1.6