Describe all integrity constraints which are violated, Database Management System

Assignment Help:

Consider the two relations given below

1064_table33.png


Given that A is the primary key of R, D is the primary key of S and there is a referential integrity among S.A and R.A, discuss all integrity constraints which are violated.

(i) Primary key of R contains the ‘null' value and the value ‘a1' is duplicated, therefore it violates the entity integrity constraint within the relation R.

(ii) In primary key of S, the value ‘d1' is duplicated; therefore it violates the entity integrity constraint within the relation S.

(iii) The foreign key S.A contains the value ‘a2', that is not available in the parent key R.A, thus it violates the referential integrity constraint within the relation S.

 


Related Discussions:- Describe all integrity constraints which are violated

Normalise data to third normal form, A software contract and consultancy fi...

A software contract and consultancy firm maintains details of all the various projects in which its employees are currently involved. These details comprise: Employee Numbe

What was the method in which records are physically stored, What was the me...

What was the method in which records are physically stored in a specified order according to a key field in each record ? A method in which records are physically stored within

Modify - referential integrity, Update or Modify operation alters the exist...

Update or Modify operation alters the existing values. If these operations alter the value that is the foreign key also, the only check need is the similar as that of the Insert op

Two phase locking technique, growing phase and shrinking phase are disjoint...

growing phase and shrinking phase are disjoint, why ?

Explain traditional programming languages, How persistent programming langu...

How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul

Functional dependency, Functional Dependency Consider a relation R that...

Functional Dependency Consider a relation R that has 2 attributes A and B. The attribute B of the relation is functionally dependent on the attribute A if and only if for every

Insert - referential integrity, The insertion of a tuple in the aim of refe...

The insertion of a tuple in the aim of reference does not cause any destruction. Though, insertion of a tuple in the relation in which, we has the foreign key, for instance, in ASS

Data handling and research methods, Data Handling and Research Methods: ...

Data Handling and Research Methods: The dataset encompassing 130 participants contains several variables measuring detrimental health related behaviours referring to the use o

What do you understand by raid, What do you understand by RAID? Explain RA...

What do you understand by RAID? Explain RAID Level 4 and Level5? RAID - It is stands for Redundant Array of Inexpensive Disks (as named by the inventor), or alternatively Re

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