What are the minimum and maximum membership amounts for all branches that either opened in 2011 or are located in London?
SELECT min(membership_amount) ,  max(membership_amount) FROM branch WHERE open_year  =  2011 OR city  =  'London'
SELECT min(membership_amount) ,  max(membership_amount) FROM branch WHERE open_year  =  2011 OR city  =  'London'
[{'min(membership_amount)': '11', 'max(membership_amount)': '91'}]