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 Faculty (FacID VARCHAR, advisor VARCHAR); CREATE TABLE Student (FacID VARCHAR, advisor VARCHAR)
### Question:
Show ids for the faculty members who don't advise any student.
### Answer:
SELECT FacID FROM Faculty EXCEPT SELECT advisor FROM Student