Test: Lekcja 7: Praca z wartościami NULL

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Question 9

Które zapytanie zwróci uczniów bez e-maila, ale mających numer telefonu (Telefon nie-NULL)?

Select one answer.

SELECT * FROM Uczniowie WHERE Email IS NULL OR Telefon IS NOT NULL;

SELECT * FROM Uczniowie WHERE Email = NULL AND Telefon IS NOT NULL;

SELECT * FROM Uczniowie WHERE Email IS NULL AND Telefon != NULL;

SELECT * FROM Uczniowie WHERE Email IS NULL AND Telefon IS NOT NULL;

Test: Lekcja 7: Praca z wartościami NULL

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