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Define Partial Key and Primary Key
A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar owner entity. Primary key is a unique key but not comprise null values. An entity set can comprise at most one primary key.
What are called journaling file systems? File systems that support log disks are known as journaling file systems.
what is union compatable?
what is the relationship between receipt and owner entities in computer sales and service company
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
Performance of Various Concurrency Control Mechanisms
You are required to implement integrity constraints within the database to enforce the following requirements: For Projects: Start date must be supplied. Start date cannot be i
why are older data base model are being replaced by new data model
Illustrate the State model for the ATM class let us take state model for the ATM class given below in Figure showing state model of the ATM class and the pseudo code derived fr
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
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