Table schema:
CREATE TABLE activity (activity_name VARCHAR); CREATE TABLE Faculty_participates_in (facID VARCHAR, actid VARCHAR); CREATE TABLE Faculty (lname VARCHAR, facID VARCHAR)

Question: Find the first names of the faculty members who participate in Canoeing and Kayaking.
SQL: SELECT T1.lname FROM Faculty AS T1 JOIN Faculty_participates_in AS T2 ON T1.facID = T2.facID JOIN activity AS T3 ON T2.actid = T2.actid WHERE T3.activity_name = 'Canoeing' INTERSECT SELECT T1.lname FROM Faculty AS T1 JOIN Faculty_participates_in AS T2 ON T1.facID = T2.facID JOIN activity AS T3 ON T2.actid = T2.actid WHERE T3.activity_name = 'Kayaking'