The answer is either D. or B. It REALLY depends on which was you are talking about. My honest answer is D.
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.
learn more about entity integrity, here:
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Answer:
they are all under fire for mismanaging cov|d 19
Answer:
In Economics, the want satisfying power of a commodity is called “utility”. Utility is the capacity of a commodity to satisfy particular human want.
<span>Advertising. Advertising tends to be extremely expensive but does not always provide much returns, and often goes completely ignored by the target audience or only reaches the people you already knew about.</span>
