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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:
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
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multiplicity constarin
The functions of DBA ?
The following relational database schema represents part of a simplified database used by a library: tblBook (BookID, Title, PublisherID, Category,Price) tblPublisher (Publishe
Type of views : Simple views and Difficult Views Feature Simple Views Complex Views Number of tables One
Explain the database Planning Project ?
Components of database manager The above functions are reached by the database manager. The major elements of a database manager are: Authorisation control: This mod
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
If one requires to access data using Logical Database , the use of events is unavoidable. Yes, if someone wants to access data using Logical database then the use of events
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