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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:
Consider the relation schemas as follows. works (person name, company name, salary); lives (person name, street, city); located in(company name, city); managers (person name
Which is another name for weak entity? Child is another name of weak entity.
i would like to ask if you will do assignment of database number of words 1500 and how much
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Have database built but having problems with some questions that go with the database
Soccer player ER Diagram to Relational database schema
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