What is the nationality of Zaha Hadid?
select nationality from architect where name = 'Zaha Hadid'
What is the gender of Frank Gehry?
select gender from architect where name = 'Frank Gehry'
What is the built year of architect id 2?
select built_year from mill where architect_id = 2
What is the location of id 3?
select location from mill where id = 3