What are the descriptions of the courses with name 'database'?
CREATE TABLE students (
    student_id number,
    date_of_registration time,
    date_of_latest_logon time,
    login_name text,
    password text,
    personal_name text,
    middle_name text,
    family_name text
)

CREATE TABLE subjects (
    subject_id number,
    subject_name text
)

CREATE TABLE courses (
    course_id number,
    author_id number,
    subject_id number,
    course_name text,
    course_description text
)

CREATE TABLE student_tests_taken (
    registration_id number,
    date_test_taken time,
    test_result text
)

CREATE TABLE student_course_enrolment (
    registration_id number,
    student_id number,
    course_id number,
    date_of_enrolment time,
    date_of_completion time
)

CREATE TABLE course_authors_and_tutors (
    author_id number,
    author_tutor_atb text,
    login_name text,
    password text,
    personal_name text,
    middle_name text,
    family_name text,
    gender_mf text,
    address_line_1 text
)
SELECT course_description FROM courses WHERE course_name = "database"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What are the descriptions of the courses with name 'database'? ### Input: CREATE TABLE students (
    student_id number,
    date_of_registration time,
    date_of_latest_logon time,
    login_name text,
    password text,
    personal_name text,
    middle_name text,
    family_name text
)

CREATE TABLE subjects (
    subject_id number,
    subject_name text
)

CREATE TABLE courses (
    course_id number,
    author_id number,
    subject_id number,
    course_name text,
    course_description text
)

CREATE TABLE student_tests_taken (
    registration_id number,
    date_test_taken time,
    test_result text
)

CREATE TABLE student_course_enrolment (
    registration_id number,
    student_id number,
    course_id number,
    date_of_enrolment time,
    date_of_completion time
)

CREATE TABLE course_authors_and_tutors (
    author_id number,
    author_tutor_atb text,
    login_name text,
    password text,
    personal_name text,
    middle_name text,
    family_name text,
    gender_mf text,
    address_line_1 text
) ### Response: SELECT course_description FROM courses WHERE course_name = "database"