Domain constraintsdomain constraints are primarily formed, Ask an Expert

Programming

Domain Constraints

Domain constraints are primarily formed for defining the logically correct values for an attribute of a relation. The relation allows attributes of a relation to be confined to a range of values, for instance, values of an attribute age can be restricted as Zero to 150 or a definite type like integers, etc.

REDUNDANCY AND ASSOCIATED PROBLEMS

Let us take the subsequent relation STUDENT

Enrolment no	Sname	Address	Cno	Cname	Instructor	Office
050112345	Rahul	D-27, main Road Ranchi	MCS-011	Problem Solution	Nayan Kumar	102
050112345	Rahul	D-27, Main Road Ranchi	MCS-012	Computer Organisation	Anurag Sharma	105
050112345	Rahul	D-27, Main Road Ranchi	MCS-014	SSAD	Preeti Anand	103
050111341	Aparna	B-III, Gurgaon	MCS-014	SSAD	Preeti Anand	103

Figure: A state of STUDENT relation

The above relation satisfies the properties of a relation and is said to be in first normal form (or 1NF). Theoretically it is convenient to have all the information in one relation as it is then likely to be simpler to query the database. But the relation over has the following undesirable kinds:

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DBMS, Programming

Category:- DBMS
Reference No.:- M9526561

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