Table schema:
CREATE TABLE architect (id VARCHAR, name VARCHAR, nationality VARCHAR); CREATE TABLE mill (architect_id VARCHAR)

Question: What is the id, name and nationality of the architect who built most mills?
SQL: 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