Task: Text to Code
Input (English): Step 1: For each row in course table, find the corresponding rows in prereq table.
Step 2: find the number of rows of each value of prereq's course_id in the results of step 1.
Step 3: find title in the results of step 1 whose corresponding value in step 2 is greater than 1
Output (English): SELECT T1.title FROM course AS T1 JOIN prereq AS T2 ON T1.course_id = T2.course_id GROUP BY T2.course_id HAVING Count ( * ) > 1