Determine bcnf-dcnf and key relation, Database Management System

Assignment Help:

(A) For the relation;

CarSales (RegNo, BuyerName, Address, SalesPerson, Make, Model, Commission)

The following functional dependences hold,

RegNo _ID à Make, Model

RegNoà Commission

RegNo, BuyerName à SalesPerson

BuyerName à Address

Make, Model à Commission

RegNo à SalesPerson

a. Use Inference rules to find the minimal basis and determine the Key of the relation

b. Based on this key, determine if the relation is in BCNF.

c. If it is not in BCNF then decompose the relation into BCNF.

3(B) The following relation holds details about cars ;

CAR_DETAILS(Registration_No , Make , Model , Tow_Load , Engine_Size, Colour )

And has the following functional dependencies;

Make , Model -> Engine_Size

Registration_No -> Make, Colour, Model

Engine_Size -> Tow_Load

The relation is decomposed into ;

CAR_DETAILS1(Registration_No , Colour, Make , Engine_Size* ,Model)

CAR_DETAILS2(Engine_Size, Tow_Load)

Prove that the decomposition is incomplete and complete the decomposition.


Related Discussions:- Determine bcnf-dcnf and key relation

Commercial database architecture, At its most essential level the DBMS arch...

At its most essential level the DBMS architecture can be divide into two parts: the back end and the front end. The back end is responsible for managing the physical database an

Task partitioning, Task Partitioning, Sequencing and Project Planning T...

Task Partitioning, Sequencing and Project Planning The tasks required for the service might be broadly partitioned into: 0.      Set up database tables and account file

Need web-based database, Our company hires independent contractors to insta...

Our company hires independent contractors to install equipment at precise locations across North America. We want to track the installation data and generate reports. The compan

Analyzing association traversal, Analyzing Association Traversal Assoc...

Analyzing Association Traversal Association Traversal shall be understood properly for the association design explanation.  Analyzing association traversal means analyzing tra

Why object-oriented system use the relational dbms, Why, generally does an ...

Why, generally does an object-oriented system use the relational DBMS? The reasons for using relational DBMS for OO systems could be any combination of following: a. Many or

Illustrate package classes and associations into models, Package classes an...

Package classes and associations into models  Programs are made of separate physical units which could be edited, imported, complied or otherwise manipulated. The careful part

The second normal form (2nf), The Second Normal Form (2NF) Definition: ...

The Second Normal Form (2NF) Definition: A relation is in 2NF if it is in 1NF and each non-key attribute is fully dependent on each candidate key of the relation. Some of th

Components of database manager, Components of database manager The ab...

Components of database manager The above functions are reached by the database manager. The major elements of a database manager are: Authorisation control: This mod

File organisation and its types, File Organisation And Its Types  Just ...

File Organisation And Its Types  Just as arrays, trees, lists and other data structures are used to execute data Organisation in main memory, a number of planning's are used to

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