Задание 1. Отобразить всех авторов, которые живут в штате, где находится издательство Press.
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Задание 2. Отобразить всех авторов, которые не написали ни одной книги.
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Задание 3. Удвоить цены всех книг, изданных компанией New Age Books
a) С помощью подзапроса
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