SELECT T2.emp_fname, T4.prof_office, T3.crs_description FROM CLASS AS T1 JOIN employee AS T2 ON T1.prof_num = T2.emp_num JOIN course AS T3 ON T1.crs_code = T3.crs_code JOIN professor AS T4 ON T2.emp_num = T4.emp_num
Find the first names and offices of all instructors who have taught some course and also find the course description.
CREATE TABLE professor (
    prof_office VARCHAR,
    emp_num VARCHAR
)

CREATE TABLE CLASS (
    prof_num VARCHAR,
    crs_code VARCHAR
)

CREATE TABLE course (
    crs_description VARCHAR,
    crs_code VARCHAR
)

CREATE TABLE employee (
    emp_fname VARCHAR,
    emp_num VARCHAR
)