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What is a Built-in
A notation of identity is built-into the data model or programming language and no user-supplied identifier is needed. This form of identity is used in object oriented systems.
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
What are the Objectives of object design After going through this unit, you could be able to: explain steps of object design; discuss algorithms that reduce costs;
statical data
Example RELATION SCHEMA for STUDENT: STUDENT (Roll No: string, name: string, login: string, age: integer) RELATION INSTANCE
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
external and internal mapping with examples
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
what are the states of transaction?
What does authentication refer? Authentication refers to the task of verifying the uniqueness of a person.
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
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