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SELECT COALESCE(salary, 0) FROM employees; -- возвращает salary, если не null, иначе 0 SELECT NULLIF(age, 0) FROM customers; -- возвращает NULL, если age равно 0, иначе age SELECT GREATEST(length('hello'), length('world')); -- возвращает 5, так как 'hello' длиннее SELECT LEAST(10, 20, 30, 40); -- возвращает 10, так как это наименьшее число

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