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Помогите сделать задание по SQL

Сломал уже голову, не знаю как сделать Вот ссылка на задание https://www.notion.so/QA-SQL-34ea48de6acf436fbe70158039813d8c

sqlmysql
25th Mar 2021, 9:14 PM
Александр Мозговой
Александр Мозговой - avatar
1 Answer
- 2
Вы пробовали использовать группу по book_id
28th Mar 2021, 3:52 PM
AKSHAY🇮🇳
AKSHAY🇮🇳 - avatar

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