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Define object-relational systems?
Systems that give object-oriented extensions to relational systems are known as object-relational systems.
Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
In E-R Diagram how derived attribute are represented ? In E-R Diagram By Dashed ellipse derived attribute are represented.
What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
To do the division operation R1 ÷ R2, R2 should be a correct subset of R1. In the following example R1 have attributes A and B and R2 have only attribute B so R2 is a correct subse
how can apply joins on table
What is the max. no. Of structures that can be included in a table or structure. Nine.
Explain the disadvantages of using DBMS There could be a few disadvantages of using DBMS. As DBMS requires computers, we have to invest a good amount in acquiring the hardwa
Security: In a centralised system, access to the data can be simply controlled. Though, in a distributed DBMS not only does access to replicated data have to be controlled in many
(a) Why did SAP introduce the extended star schema?
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