Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE students (student_id VARCHAR)
TABLE: CREATE TABLE courses (course_name VARCHAR, course_id VARCHAR)
TABLE: CREATE TABLE student_course_registrations (course_id VARCHAR, student_id VARCHAR)

### Question ###
How many registed students do each course have? List course name and the number of their registered students?

### Accurate SQL ###

SELECT T3.course_name, COUNT(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id JOIN courses AS T3 ON T2.course_id = T3.course_id GROUP BY T2.course_id