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

How many students are 18 years old?
SELECT COUNT(*) FROM student WHERE age = 18
SELECT COUNT(*) FROM "student" WHERE "age" = 18