Like yourself I’m unsure with this one. I suggested they test…
The validation suggested/or they suggested in their data dictionary e.g.
Contact phone in Traveller table being 11 characters long
Male/Female in Traveller table only allowing M or F
Number of stars in Venue table only accepting a number between 1 and 6
Some queries of their choice to prove the tables link together
e.g. Find a list of people staying on the Isle of Arran
A test for Task 5 – pupils calculates what the increase of cost per night might be using a calculator and checks this against what the IIF function they used in the database gets.
Hope that helps.