user: Question: What is the Church made from in Hamburg?
Columns: ['Name', 'Country', 'Town', 'Height metres / ft', 'Structural type', 'Held record']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Great Pyramid of Giza', 'Egypt', 'Giza', '146 / 480', 'Mausoleum', '2570 BC–1311']
SQL:

assistant: SELECT "Held record" FROM "Table" WHERE "Structural type" = 'Church' AND "Town" = 'Hamburg';