Task: Text to Code
Input (English): Step 1: For each row in Course_Authors_and_Tutors table, find the corresponding rows in Courses table.
Step 2: find personal_name of the results of step 1 whose course_name equals advanced database
Output (English): SELECT T1.personal_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"