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Як вибрати всі записи з таблиці "customers", які не мають значення в колонці "em...

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Як вибрати всі записи з таблиці "customers", які не мають значення в колонці "email" (пусте поле)?

SELECT * FROM customers WHERE email = NULL

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SELECT * FROM customers WHERE email IS NULL

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SELECT * FROM customers WHERE email NOT EXISTS

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SELECT * FROM customers WHERE email = ''

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SELECT * FROM customers WHERE email EMPTY

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