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region_id region_name students_amount
1 Region 1 0
2 Region 2 0
3 Region 3 0
student_id student_name region_id
1 Student 1 1
2 Student 2 2
3 Student 3 1
4 Student 4 1
region_id region_name students_amount
1 Region 1 3
2 Region 2 1
3 Region 3 0
student_id student_name region_id
1 Student 1 1
2 Student 2 2
3 Student 3 1
4 Student 4 1
5 Student 5 1
6 Student 6 2
7 Student 7 3
8 Student 8 3
region_id region_name students_amount
1 Region 1 4
2 Region 2 2
3 Region 3 2