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Notes:


I mentioned earlier that Sequel code is generally very concise.

One of the tricks Sequel uses to keep code concise is that it allows you to use a single symbol to contain both a table and a column, by separating them with a double underscore.

It allows a single symbol to contain both a column and an alias by separating them with a triple underscore.

It also allows you to combine the two approaches by using both a double underscore and a triple underscore in the same symbol.