CREATE TABLE university (school_id NUMBER, school CLOB, location CLOB, founded NUMBER, affiliation CLOB, enrollment NUMBER, nickname CLOB, primary_conference CLOB)
CREATE TABLE basketball_match (team_id NUMBER, school_id NUMBER, team_name CLOB, acc_regular_season CLOB, acc_percent CLOB, acc_home CLOB, acc_road CLOB, all_games CLOB, all_games_percent NUMBER, all_home CLOB, all_road CLOB, all_neutral CLOB)

Find the team names of the universities whose enrollments are smaller than the average enrollment size.
SELECT t2.team_name FROM university AS t1 JOIN basketball_match AS t2 ON t1.school_id = t2.school_id WHERE enrollment < (SELECT AVG(enrollment) FROM university)
SELECT "t2"."team_name" FROM "university" "t1" JOIN "basketball_match" "t2" ON "t1"."school_id" = "t2"."school_id" WHERE "enrollment" < (SELECT AVG("enrollment") FROM "university")