Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE branch (membership_amount INTEGER, open_year VARCHAR, city VARCHAR)
### Question:
Show minimum and maximum amount of memberships for all branches opened in 2011 or located at city London.
### Answer:
SELECT MIN(membership_amount), MAX(membership_amount) FROM branch WHERE open_year = 2011 OR city = 'London'