EQs can contain business data, control data and rules based data.
Business Applications: An example of Business data is customer names, addresses, phone number, so on and so forth. An example of Rules Data is a table entry that tells how many days a customer can be late before they are turned over for collection.
Drop Down List (a listing of customers by name) would be an example of an EQ.
A screen full of customer address information would be an example of an EQ.
Reset (or restore) functionality where all the modified fields are reset to their saved values. The key to understanding this an external query is the “reset to their saved values.” Clearly a table is being read.