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

Show the ids of students whose advisors are professors.
SELECT T2.stuid FROM faculty AS T1 JOIN student AS T2 ON T1.facid = T2.advisor WHERE T1.rank = "Professor"
SELECT "T2"."stuid" FROM "faculty" "T1" JOIN "student" "T2" ON "T1"."facid" = "T2"."advisor" WHERE "Professor" = "T1"."rank"