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 member (member_name VARCHAR, party_id VARCHAR)
### Question:
Show the member names which are in both the party with id 3 and the party with id 1.
### Answer:
SELECT member_name FROM member WHERE party_id = 3 INTERSECT SELECT member_name FROM member WHERE party_id = 1