If the attribute phone number is included in the relation all the values need not be entered into the phone number column. This type of entry is given as

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Mr. Dubey • 51.47K Points
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Q.) If the attribute phone number is included in the relation all the values need not be entered into the phone number column. This type of entry is given as

(A) 0

(B) –

(D) empty space

Correct answer : Option (C) - null

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