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I got a little ahead of myself. First, I should explain the interesting little creature you see on screen.

This is the Sequel dataset, and it is what gives Sequel a lot of its flexibility.

A dataset represents an SQL query, or more generally, an abstract set of objects.

At any point you can turn that abstract set into a concrete set by calling all.

As shown here, datasets are usually created by calling the array access operator on the database object with a symbol.