Cases of constraint violations, Database Management System

Assignment Help:

(1) Insert<1, 'Vipin', 20, 'Mayur Vihar'> into PERSON

Violated constraint: - Key constraint

Reason: - Primary key 1 already exists in PERSON.

Dealing: - DBMS could ask the user to provide valid PERSON_ID value and accept the insertion if valid PERSON_ID value is provided.

(2) Insert<'null', 'Anurag', 25, 'Patparganj'> into PERSON

Violated constraint: - Entity Integrity constraint

Reason: - Primary key is 'null'.

Dealing: - DBMS could ask the user to provide valid PERSON_ID value and accept the insertion if valid PERSON_ID value is provided.

(3) Insert<'abc', 'Suman', 25, 'IP college'> into PERSON

Violated constraint: - Domain constraint

Reason: - value of PERSON_ID is given a string which is not valid.

(4) Insert <10, 'Anu', 25, 'Patpatganj'> into PERSON

Violated constraint: - None

Note: In all first three cases of constraint violations above DBMS could decline the insertion.

Related Discussions:- Cases of constraint violations

Disadvantages or unsecure, In Database software have only pure security or ...

In Database software have only pure security or some dis secured by administrator?

Farm management system, draw er diagram using entities crop,employee,depart...

draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer

Unit database integrity, Relations create the database. They must satisfy v...

Relations create the database. They must satisfy various properties, like no duplicate tuples, no ordering of tuples, and atomic attributes, etc. Relations that satisfy these basic

What is a dataset, What is a dataset? A dataset is an in-memory databas...

What is a dataset? A dataset is an in-memory database that is disconnected from any regular database, but has all the significant characteristics of a regular database. Dataset

What is a view, What is a view? Make a view of EMP table named DEPT 20, to...

What is a view? Make a view of EMP table named DEPT 20, to display the employees in department 20 and their annual salary. Ans: View is a virtual table that does not consist

Mis, explain three types of internet risks to the consummers whent he busin...

explain three types of internet risks to the consummers whent he business system is data dependent. how can we minimise these risks

Information infrasctructure., what factors might influence a company to out...

what factors might influence a company to outsource its IT infrascture.

Draw and explain the three level architecture of database, Draw and explain...

Draw and explain the three level architecture of the database system? A DBMS gives three levels of data is said to follow three-level architecture. The trget of the three-schem

Differences among the candidate keys and the primary key, Discuss the diffe...

Discuss the differences among the candidate keys and the primary key of a relation. Give instance to describe your answer? A candidate key is one that can be used as primary ke

Consider relational schema and construct algebra query, Consider the follow...

Consider the following relational schema: PERSON (SS#, NAME, ADDRESS) CAR (REGISTRATION_NUMBER, YEAR, MODEL) ACCIDENT (DATE, DRIVER, CAR_REG_NO) OWNS (SS#, LICENSE) Constru

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages