Which last names are both used by customers and by staff?
CREATE TABLE Customers (last_name VARCHAR); CREATE TABLE Staff (last_name VARCHAR)
SELECT last_name FROM Customers INTERSECT SELECT last_name FROM Staff
### Context: CREATE TABLE Customers (last_name VARCHAR); CREATE TABLE Staff (last_name VARCHAR) ### Question: Which last names are both used by customers and by staff? ### Answer: SELECT last_name FROM Customers INTERSECT SELECT last_name FROM Staff