CREATE TABLE architect (id TEXT, name TEXT, nationality TEXT, gender TEXT)
CREATE TABLE mill (architect_id DECIMAL, id DECIMAL, location TEXT, name TEXT, type TEXT, built_year DECIMAL, notes TEXT)
CREATE TABLE bridge (architect_id DECIMAL, id DECIMAL, name TEXT, location TEXT, length_meters DECIMAL, length_feet DECIMAL)

What is the id, name and nationality of the architect who built most mills?
SELECT T1.id, T1.name, T1.nationality FROM architect AS T1 JOIN mill AS T2 ON T1.id = T2.architect_id GROUP BY T1.id ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T1"."id", "T1"."name", "T1"."nationality" FROM "architect" AS "T1" JOIN "mill" AS "T2" ON "T1"."id" = "T2"."architect_id" GROUP BY "T1"."id" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1