5 years ago in Database Management System

The ________ states that a foreign key must either match a primary key value in another relation or it must be null.

[A] entity integrity rule
[B] referential integrity constraint
[C] action assertion
[D] composite attribute
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Attempted 624
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Incorrect 222
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Answers

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Amar Dobliyal - 1 year ago

option B is Correct

Raghuveer Dhakad - 2 years ago

Option B is right

Anshul Chauhan - 2 years ago

could some plz explain me how its A..

Bhawna wadhwa - 2 years ago

option B is right

Bhawna wadhwa - 2 years ago

entity integrity means no attribute of a primary key can have a null value

luna - 2 years ago

its option B

zeshan khalid - 2 years ago

B is right............

Chayan Halder - 2 years ago

It is Option B

Muzzammil Khawaja - 2 years ago

it must be referential integrity constraint . correct option is: B

husnain - 3 years ago

yes, it must be referential integrity constraint

pooja arora - 4 years ago

it must be referential integrity constraint...

Tsega Asresa Mengistu
Tsega Asresa Mengistu - 1 week ago

Tsega Asresa Mengistu from Dessie, Ethiopia is saying referential integrity constraint is correct answer

Serkie Mekonnen
Serkie Mekonnen - 1 week ago

Serkie Mekonnen from Dessie, Ethiopia is saying entity integrity rule is correct answer

Usman Sheikh
Usman Sheikh - 3 weeks ago

Usman Sheikh from Chichawatni, Pakistan is saying referential integrity constraint is correct answer

sureshbabu vampugadapa
sureshbabu vampugadapa - 1 month ago

sureshbabu vampugadapa from Guntur, India is saying referential integrity constraint is correct answer

Abdul Haseeb Shershahabadi
Abdul Haseeb Shershahabadi - 1 month ago

Abdul Haseeb Shershahabadi from Birpur, India is saying entity integrity rule is correct answer

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