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- id | id_course | lesson_title
- 1 | 3 | Урок 1
- 2 | 3 | Урок 2
- 3 | 3 | Урок 3
- 4 | 4 | Урок 4
- 5 | 4 | Урок 5
- id | id_lesson | email | date
- 43 | 1 | 123@gmail.com | 2018-07-09 13:17:05
- 44 | 2 | 123@gmail.com | 2018-07-09 13:18:05
- 45 | 3 | 123@gmail.com | 2018-07-09 13:19:05
- SELECT l.id_course, h.email, MAX(h.date)
- FROM lesson l
- LEFT JOIN history h ON h.id_lesson = l.id
- GROUP BY l.id_course, h.email
- HAVING SUM(h.id_lesson IS NULL) = 0
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