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Представлено 2 стовпці таблиці Elements: +--------+------+ | Name | Year ...
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Представлено 2 стовпці таблиці Elements:
+--------+------+| Name | Year |+--------+------+| Au | NULL || Be | 1798 || Fr | 1939 || Uus | 2010 |+--------+------+Скільки рядків поверне запит?SELECT * FROM Elements WHERE Year NOT IN (SELECT Year FROM Elements)
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