CREATE TABLE restaurant_type (restypeid DECIMAL, restypename TEXT, restypedescription TEXT)
CREATE TABLE student (stuid DECIMAL, lname TEXT, fname TEXT, age DECIMAL, sex TEXT, major DECIMAL, advisor DECIMAL, city_code TEXT)
CREATE TABLE type_of_restaurant (resid DECIMAL, restypeid DECIMAL)
CREATE TABLE restaurant (resid DECIMAL, resname TEXT, address TEXT, rating DECIMAL)
CREATE TABLE visits_restaurant (stuid DECIMAL, resid DECIMAL, time TIME, spent DECIMAL)

What is the gender of the student Linda Smith?
SELECT sex FROM student WHERE fname = "Linda" AND lname = "Smith"
SELECT "sex" FROM "student" WHERE "Linda" = "fname" AND "Smith" = "lname"