Comment by rramadass

You seem to be confused between the mathematical definition of a Relation and the English usage of the word "Relation".

> You said multiple relations earlier, which is what the comment was in reply to. Why the fliply-flopping?

Read my definition above again; I said "multiple sets" and NOT "multiple relations" which is a very different thing. You understood it wrong.

> Relation, not relations, not relationships. The struggle is real.

Only for you. I have been very clear in the usage of my terms above. A Table encodes a Relation. Additionally, when you do a JOIN across Tables you are manifesting a "Relationship" (English usage) which may/may not result in a Mathematical Relation.

> a relation is a table with additional constraints – a superset.

No, If there are additional constraints on set A than on set B then A cannot be a superset of B but a subset.