CREATE TABLE Courses (author_id VARCHAR(255), course_name VARCHAR(255)); CREATE TABLE Course_Authors_and_Tutors (login_name VARCHAR(255), author_id VARCHAR(255))
Find the login name of the course author that teaches the course with name "advanced database".
    
SQL: SELECT T1.login_name FROM Course_Authors_and_Tutors AS T1 JOIN Courses AS T2 ON T1.author_id = T2.author_id WHERE T2.course_name = "advanced database"