How would you do this with the SQL IN operator to select multiple nationalities?
... WHERE artists.Nationality IN (${selectNationality}) ...
observable seems to surround javascript strings with quotes when converting to sql, and it does the same thing for lists, but then the query doesn't work, because lists have a sequence of quotes, and I've been tinkering with it, but haven't gotten it to work.
On another note, are you aware of any forum for observableHQ to escalate questions?