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 has_pet (stuid VARCHAR); CREATE TABLE student (stuid VARCHAR)
### Question:
For students who have pets , how many pets does each student have ? list their ids instead of names .
### Answer:
SELECT COUNT(*), t1.stuid FROM student AS t1 JOIN has_pet AS t2 ON t1.stuid = t2.stuid GROUP BY t1.stuid