How many different affiliations do the authors of 'The Poetess Archive Database' have?
Count the different affiliations of the authors of 'The Poetess Archive Database'.
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/journals/dhq/Mandell09> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/journals/dhq/Mandell09>