--- a
+++ b/inst/queries/datasetFieldN.xq
@@ -0,0 +1,6 @@
+; datasetFieldN
+(fn [dataset]
+   (:count (car (query {:select [[:%count.field.name :count]]
+                        :from [:dataset]
+                        :join [:field [:= :dataset.id :dataset_id]]
+                        :where [:= :dataset.name dataset]}))))