CREATE TABLE student (stuid NUMBER, lname CLOB, fname CLOB, age NUMBER, sex CLOB, major NUMBER, advisor NUMBER, city_code CLOB)
CREATE TABLE allergy_type (allergy CLOB, allergytype CLOB)
CREATE TABLE has_allergy (stuid NUMBER, allergy CLOB)

Show student ids for all male students.
SELECT stuid FROM student WHERE sex = 'M'
SELECT "stuid" FROM "student" WHERE "sex" = 'M'