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

What are the faculty id and the number of students each faculty has?
SELECT T1.facid, COUNT(*) FROM faculty AS T1 JOIN student AS T2 ON T1.facid = T2.advisor GROUP BY T1.facid
SELECT "T1"."facid", COUNT(*) FROM "faculty" AS "T1" JOIN "student" AS "T2" ON "T1"."facid" = "T2"."advisor" GROUP BY "T1"."facid"