##Instruction:
Database: student_assessment
Total Tables: 9
Total Columns: 38

Table Schemas:

student_assessment contains tables such as Addresses, People, Students, Courses, People_Addresses, Student_Course_Registrations, Student_Course_Attendance, Candidates, Candidate_Assessments.
Table Addresses has columns such as address_id, line_1, line_2, city, zip_postcode, state_province_county, country.
address_id is the primary key.
Table People has columns such as person_id, first_name, middle_name, last_name, cell_mobile_number, email_address, login_name, password.
person_id is the primary key.
Table Students has columns such as student_id, student_details.
student_id is the primary key.
Table Courses has columns such as course_id, course_name, course_description, other_details.
course_id is the primary key.
Table People_Addresses has columns such as person_address_id, person_id, address_id, date_from, date_to.
person_address_id is the primary key.
Table Student_Course_Registrations has columns such as student_id, course_id, registration_date.
student_id is the primary key.
Table Student_Course_Attendance has columns such as student_id, course_id, date_of_attendance.
student_id is the primary key.
Table Candidates has columns such as candidate_id, candidate_details.
candidate_id is the primary key.
Table Candidate_Assessments has columns such as candidate_id, qualification, assessment_date, asessment_outcome_code.
candidate_id is the primary key.
The student_id of Students is the foreign key of person_id of People.
The address_id of People_Addresses is the foreign key of address_id of Addresses.
The person_id of People_Addresses is the foreign key of person_id of People.
The course_id of Student_Course_Registrations is the foreign key of course_id of Courses.
The student_id of Student_Course_Registrations is the foreign key of student_id of Students.
The student_id of Student_Course_Attendance is the foreign key of student_id of Student_Course_Registrations.
The course_id of Student_Course_Attendance is the foreign key of course_id of Student_Course_Registrations.
The candidate_id of Candidates is the foreign key of person_id of People.
The candidate_id of Candidate_Assessments is the foreign key of candidate_id of Candidates.

##Role Access Policy (Column-Level):
Role: StudentSelfService
Accessible Columns: People: person_id, first_name, middle_name, last_name, email_address; Students: student_id, student_details; Courses: course_id, course_name, course_description; Student_Course_Registrations: student_id, course_id, registration_date; Student_Course_Attendance: student_id, course_id, date_of_attendance

Based on the above schema and your role's column-level access policy, generate a SQL query to answer the question. If your role does not have access to the required columns, respond with: "Sorry, I cannot answer."


Question: List the id of students who registered some courses and the number of their registered courses?
Answer: SELECT T1.student_id ,  count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id
Permission: allowed (All required columns are permitted)
Gold SQL: SELECT T1.student_id ,  count(*) FROM students AS T1 JOIN student_course_registrations AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id