I've got a good feeling about this one. The key is remembering the basic components of a JOIN query - you need to specify the tables you're joining, and the criteria for how the data in those tables should be matched up. So I'd say the relationship defining cardinality is one, and the other is probably a reference to the two queries being joined.
Okay, for a JOIN query, I'd say the two things that need to be defined are the relationship between the tables being joined, and the columns/fields that are being used to match the data between the tables. The cardinality option sounds right to me.
Hmm, I'm a bit unsure about this one. I know JOIN queries involve combining data from multiple tables, but I'm not totally clear on all the specific elements that need to be defined. I'll have to think this through carefully.
This one seems pretty straightforward - I think the key is to focus on the JOIN query part of the question. The options mention things like references, cached results, and expressions, but those don't really seem relevant to a JOIN query.
Leonardo
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