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Give an example of multiple inheritance.
One example of multiple inheritance is a committee for students affair which include faculty and administrative staff member.
Figure: Multiple inheritance
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
Relational Algebra is a set of basic operations used to influence the data in relational model. These operations allow the user to specify basic retrieval request. The result of re
explain ER Modeling?
How the time stamps are implemented Use the value of the system clock as the time stamp. That is a transaction's time stamp is equivalent to the value of the clock when the tra
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
What is first normal form? The domain of attribute must contain only atomic (simple, indivisible) values.
What is serializability? Explain its types? The data base system must control concurrent implementation of transactions, to ensure that the data base state remains consistent.
Performance of Various Concurrency Control Mechanisms
deffine class&object
In the ER diagram, one example of subclassing is depicted following the Services entity. The subclasses Item Based and Time Based are created. The entity Services gains the attribu
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