CREATE TABLE courses (course_id DECIMAL, author_id DECIMAL, subject_id DECIMAL, course_name TEXT, course_description TEXT)
CREATE TABLE course_authors_and_tutors (author_id DECIMAL, 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)
CREATE TABLE subjects (subject_id DECIMAL, subject_name TEXT)
CREATE TABLE student_course_enrolment (registration_id DECIMAL, student_id DECIMAL, course_id DECIMAL, date_of_enrolment TIME, date_of_completion TIME)
CREATE TABLE student_tests_taken (registration_id DECIMAL, date_test_taken TIME, test_result TEXT)
CREATE TABLE students (student_id DECIMAL, date_of_registration TIME, date_of_latest_logon TIME, login_name TEXT, password TEXT, personal_name TEXT, middle_name TEXT, family_name TEXT)

Find the names of courses taught by the tutor who has personal name 'Julio'.
SELECT T2.course_name FROM course_authors_and_tutors AS T1 JOIN courses AS T2 ON T1.author_id = T2.author_id WHERE T1.personal_name = "Julio"
SELECT "T2"."course_name" FROM "course_authors_and_tutors" AS "T1" JOIN "courses" AS "T2" ON "T1"."author_id" = "T2"."author_id" WHERE "Julio" = "T1"."personal_name"