Task: Text to Code
Input (English): Step 1: find the student_id of Student_Course_Attendance table.
Step 2: find the Students's student_id of Students table whose Students's student_id not one of the results of step 1
Output (English): SELECT T1.student_id FROM Students AS T1 WHERE T1.student_id NOT IN ( SELECT T2.student_id FROM Student_Course_Attendance AS T2 )