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Explain the Natural join
Natural join is a binary operator which is written as (R* S) in which R and S are relations. The effect of the natural join is the set of all combinations of tuples in R and S which are equal on their general attribute names. In this just only one column along attributes comprising similar name is retained.
Explain the conventions for displaying an ER schema as an ER diagram? An E-R Diagram scheme might describe certain constraints to that the contents of a database must conform.
If the deletion violates referential integrity constraint, then three alternatives are available: Default option: - refuse the deletion. It is the job of the DBMS to describ
Project Description: We have purchased facebook style chat software which we are using with our site. It is prepared in PHP but the rest of the site is developed asp.net. Iss
Architectural standard: Designation : Architect , Consultant Job Profile : As a part of Oracle Fusion Middleware at Satyam, I am involved with Presales, Delivery, A
What is the use of keyword ISA? The use of keyword ISA is to show that a class is a specialization of another class.
i need to implememnt a treee based mining algorithm. do you have an expert that can do that?
What is foreign key? A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a
Give an example of operations from the State Actions and Activities. For instance, in bank the activity verify account code and verify password
Illustrate the view of software architecture A model is a semantically closed abstraction of system composes of elements. It can be visualized using any of the following five v
How many types of Views are there? There are Four types of views:- Database View Help View Projection View Maintenance View
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