CREATE TABLE department (dno DECIMAL, division TEXT, dname TEXT, room TEXT, building TEXT, dphone DECIMAL)
CREATE TABLE gradeconversion (lettergrade TEXT, gradepoint DECIMAL)
CREATE TABLE minor_in (stuid DECIMAL, dno DECIMAL)
CREATE TABLE course (cid TEXT, cname TEXT, credits DECIMAL, instructor DECIMAL, days TEXT, hours TEXT, dno DECIMAL)
CREATE TABLE enrolled_in (stuid DECIMAL, cid TEXT, grade TEXT)
CREATE TABLE student (stuid DECIMAL, lname TEXT, fname TEXT, age DECIMAL, sex TEXT, major DECIMAL, advisor DECIMAL, city_code TEXT)
CREATE TABLE faculty (facid DECIMAL, lname TEXT, fname TEXT, rank TEXT, sex TEXT, phone DECIMAL, room TEXT, building TEXT)
CREATE TABLE member_of (facid DECIMAL, dno DECIMAL, appt_type TEXT)

Find the max and min grade point for all letter grade.
SELECT MAX(gradepoint), MIN(gradepoint) FROM gradeconversion
SELECT MAX("gradepoint"), MIN("gradepoint") FROM "gradeconversion"