Table schema:
CREATE TABLE student (fname VARCHAR, sex VARCHAR, stuid VARCHAR); CREATE TABLE has_pet (stuid VARCHAR)

Question: Find the first name and gender of student who have more than one pet.
SQL: SELECT T1.fname, T1.sex FROM student AS T1 JOIN has_pet AS T2 ON T1.stuid = T2.stuid GROUP BY T1.stuid HAVING COUNT(*) > 1