By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
Records: 3 Duplicates: 0 Warnings: 0
stud | id_prepod | counter |
---|---|---|
иванов | 1111 | 1 |
иванов | 2222 | 4 |
петров | 1111 | 2 |
stud | id_prepod | counter |
---|---|---|
иванов | 2222 | 4 |
петров | 1111 | 2 |
stud | id_prepod | counter |
---|---|---|
иванов | 2222 | 4 |
петров | 1111 | 2 |