От: | Фукерман | ||
Дата: | 12.01.11 15:16 | ||
Оценка: |
SELECT group_name,teacher,datetime
FROM (
SELECT datetime,groups.name AS group_name,users.name AS teacher
FROM study_process,students,groups,users
WHERE groups.id = students.group
AND students.id = study_process.student_id
AND users.id = groups.owner
ORDER BY groups.name,datetime DESC
) AS tmp
GROUP BY group_name