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 Participates_in (StuID VARCHAR); CREATE TABLE Student (StuID VARCHAR)
### Question:
Show the ids of the students who don't participate in any activity.
### Answer:
SELECT StuID FROM Student EXCEPT SELECT StuID FROM Participates_in