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3NF Normal Form
A relation schema R is in 3NF if it is in 2NF and for each FD X A either of the following is true
In other words, if every non prime attribute is non-transitively related on primary key.
Rules Of Data Normalisation Let us now summarise Normalisation with the help of various clean rules. The following are the necessary rules for the Normalisation process: 1.
Explain Object oriented Model ? Object Oriented Model - This model is based on the object-oriented programming language paradigm. It involves the features of OOP such as inhe
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
4. Describe three ways to handle missing field values
The scenario You have been approached to design and implement a prototype of a distributed information system for a national car part retail outlet chain. The company comprises
A step-wise distributed database design methodology Following is a step-wise methodology for distributed database design. (1) Examine the nature of distribution. Find out wh
In an organisation various projects are undertaken. Each projects can employ one or more employees. Every employee can work on one or more projects. Each project is undertaken on
Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--
3 assignments combined in 1
Creating views with check option : This option limits those updates of data values that cause records to go off the view. The following instance tells this in more detail: Examp
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