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Entity types that do not have any key attribute, and therefore cannot be identified independently, are known as weak entity types. A weak entity can be recognized uniquely only by considering some of its attributes in conjunction with the primary key attributes of another entity, which is known as the identifying owner entity.
Usually a partial key is attached to a weak entity type that is used for unique identification of weak entities associated to a particular owner entity type. The following restrictions must hold:
Define rotational latency time. The time spent waiting for the sector to be accessed to appear under the head is known as the rotational latency time.
It defines that the tuple in one relation that refers to another relation must refer to an existing tuple in that relation. This constraint is states on two relations (not essentia
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explain equi-join using illustration
Define Fifth Normal form is concerned with Ans : Fifth Normal form is concerned with Join dependency.
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