The entity integrity rule states that a primary key attribute can be null. Thus the statement is false.
<h3>What is an entity?</h3>
An entity is refer to any object that exists in reality. These entities are Independent in nature. Each row in a table should be a distinct entity, which is ensured by entity integrity.
The entity integrity rule states that a primary key attribute can not be null as it shows unique characteristics of an entity.No primary key value can be null according to the entity integrity constraint because it is needed to identify specific attribute values in relation.
Therefore, the statement is False.
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Answer:
Islam spread arcoss North Africa into the eastern Horn of Africa, and even over the SAHARA DESERT into the West Africa. The arrival had a major impact on the political and social development of those regions, and it remains a significant force in Africa today
Answer:all are natural goods except from oil,nickel and gravel.water is natural and manufactured
Explanation:
