CREATE TABLE Participates_in (StuID VARCHAR)
CREATE TABLE Student (fname VARCHAR, lname VARCHAR, StuID VARCHAR)

What is the first and last name of the student participating in the most activities?
SELECT T1.fname, T1.lname FROM Student AS T1 JOIN Participates_in AS T2 ON T1.StuID = T2.StuID GROUP BY T1.StuID ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T1"."fname", "T1"."lname" FROM "Student" AS "T1" JOIN "Participates_in" AS "T2" ON "T1"."StuID" = "T2"."StuID" GROUP BY "T1"."StuID" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1