Define integrity, Database Management System

Assignment Help:

(a) Explain briefly the three parts of a relational Model.

(b) Contrast the following terms with an appropriate example:

(i) stored attribute v/s derived attribute
(ii) entity type v/s entity instance
(iii) strong entity type v/s weak entity type
(iv) simple attribute v/s composite attribute
(v) unary relationship v/s binary relationship.

(c) The term integrity refers to the accuracy or correctness of the data in the database. Define the following terms:

(i) Domain Integrity
(ii) Entity Integrity
(iii) Referential Integrity.

(d) Constraints are rules that restrict the data values that you can enter into a field in a database table. Briefly describe the following constraint with appropriate example for each:

(i) Check Constraint
(ii) Not Null Constraint
(iii) Unique Constraint


Related Discussions:- Define integrity

What are the reasons for having variable length records, What are the reaso...

What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa

Derived horizontal fragmentation, Derived horizontal fragmentation: Some ap...

Derived horizontal fragmentation: Some applications may include a join of two or more relations. If the relations are stored at dissimilar locations, there may be a major overhead

Operator precedence-data manipulation language, Operator Precedence The...

Operator Precedence The basic operators used in SQL are * /   - + Operators of the similar priority are evaluated From Left to right Parentheses are used to force priorit

Student database, tell me the functionality,advantages and disadvantages of...

tell me the functionality,advantages and disadvantages of student database

What is a recursive relationship, Question: (a) Can a set of data requi...

Question: (a) Can a set of data requirements be correctly modelled by two or more different ER diagrams? Explain your answer. You may use a small example, if you think it will

ER DIAGRAM, NEED ER DIAGRAM WITH MINIMUM ENTITY AND RELATIONSHIP of Hospita...

NEED ER DIAGRAM WITH MINIMUM ENTITY AND RELATIONSHIP of Hospital Management System

Transaction states, The following variant of the primary copy asynchronous-...

The following variant of the primary copy asynchronous-update replication protocol has been proposed for totally replicated systems. (a)  A transaction executing at site A updat

Explain nested relations, Explain nested relations? Nested relations ...

Explain nested relations? Nested relations The assumption of INF is a natural one in the bank examples we have considered. However, not all applications are best modelled

Having clause-data manipulation language, Having clause This clause...

Having clause This clause is used for producing conditions on grouped information. Example: Find maximum salary and department number of those departments where maxim

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd