Describe Domain Constraints?

1.	Describe Domain Constraints?
Answer» Domain constraints include entity integrity and REFERENTIAL integrity. The domain is a SET of values that may be assigned to an attribute. The entity integrity rule states that no part of a primary key cannot be NULL. Referential integrity states that each foreign key value must MATCH a primary key value or be null. Domain constraints include entity integrity and referential integrity. The domain is a set of values that may be assigned to an attribute. The entity integrity rule states that no part of a primary key cannot be null. Referential integrity states that each foreign key value must match a primary key value or be null.

Answer»

Domain constraints include entity integrity and REFERENTIAL integrity. The domain is a SET of values that may be assigned to an attribute. The entity integrity rule states that no part of a primary key cannot be NULL. Referential integrity states that each foreign key value must MATCH a primary key value or be null.

Domain constraints include entity integrity and referential integrity. The domain is a set of values that may be assigned to an attribute. The entity integrity rule states that no part of a primary key cannot be null. Referential integrity states that each foreign key value must match a primary key value or be null.

Discussion

No Comment Found

Related InterviewSolutions

What Is Lock Granularity?
In General, How Should The Boundaries Of A Transaction Be Defined?
Explain The Meaning Of The Expression Acid Transaction?
Explain The Necessity Of Defining Processing Rights And Responsibilities. How Are Such Responsibilities Enforced?
Explain How A Database Could Be Recovered Via Reprocessing. Why Is This Generally Not Feasible?
Define Rollback And Roll Forward?
Why Is It Important To Write To The Log Before Changing The Database Values?
Explain The Difference Between A Database Administrator And A Data Administrator?
What Is The Foreign Key?
What Is A Candidate Key?