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Explain What is Relation?
A database relation is a predefined row or column format for storing information in a relational database. Relations are equal to tables.
Replication : It is definite as a copy of a relation. Every replica is stored at a dissimilar site. The alternative to replication is to store only single copy of a relation which
Objectives After reading this unit you should be able to: Explain storage of databases on hard disks; Discuss the execution of various file Organisation techniques;
One-way Associations When an association is traversed only in the one direction, then it is implemented as a pointer i.e.an attribute which contains an object reference. If mu
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
what is database management system? & why it is required?
Which method of access uses key transformation? A Hash method of access uses key transformation.
Security: Data not needed by local applications is not stored at the site, therefore no unnecessary security violations may exist. But how can we carry out fragmentation? Fragm
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
What is the use of keyword ISA? The use of keyword ISA is to show that a class is a specialization of another class.
A database for the Service and Maintenance (SM) section of a Computer sales and service Company has to be developed. SM gives after sales service to customers. SM branch has a numb
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