CREATE TABLE participates_in (stuid DECIMAL, actid DECIMAL)
CREATE TABLE activity (actid DECIMAL, activity_name TEXT)
CREATE TABLE student (stuid DECIMAL, lname TEXT, fname TEXT, age DECIMAL, sex TEXT, major DECIMAL, advisor DECIMAL, city_code TEXT)
CREATE TABLE faculty_participates_in (facid DECIMAL, actid DECIMAL)
CREATE TABLE faculty (facid DECIMAL, lname TEXT, fname TEXT, rank TEXT, sex TEXT, phone DECIMAL, room TEXT, building TEXT)

Tell me the first and last name of the student who has 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