CREATE TABLE courses (course_name VARCHAR, course_id VARCHAR)
CREATE TABLE student_course_registrations (student_id VARCHAR, course_id VARCHAR)

What are the ids of all students for courses and what are the names of those courses?
SELECT T1.student_id, T2.course_name FROM student_course_registrations AS T1 JOIN courses AS T2 ON T1.course_id = T2.course_id
SELECT "T1"."student_id", "T2"."course_name" FROM "student_course_registrations" AS "T1" JOIN "courses" AS "T2" ON "T1"."course_id" = "T2"."course_id"