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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:
Homework chapter 10 no 3
How many types of users works on database? Users are differentiated through the way they expect to interact along with the system (i) Application programmers-interact with
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what is bogus empowerment. And what is genuine empowerment
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