user: Question: What are the Notes of the Mill Built in the 19th century?
Columns: ['Location', 'Name of mill', 'Type', 'Built', 'Notes']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Andenne', 'Molen de Stud', 'Grondzeiler', '18th century', 'Molenechos (Dutch)']
SQL:

assistant: SELECT "Notes" FROM "Table" WHERE "Built" = '19th century';