Define the boyce-codd normal form, Database Management System

Assignment Help:

Define the Boyce-Codd Normal Form with instance and also Compare BCNF and 3NF.

Ans: BCNF: For each functional dependency X->Y in a set F of functional dependencies over relation R, either:

Y is a subset of X or,
X is a superkey of R

While

3NF: For each functional dependency X->Y in a set F of functional dependencies over relation R, either:

Y is a subset of X or,
X is a superkey of R, or
Y is a subset of K for few key K of R

a. there is no subset of a key is a key

Related Discussions:- Define the boyce-codd normal form

What is predictive modelling, Question : (a) Data mining is one of the...

Question : (a) Data mining is one of the best ways to analyse data and using software method, hidden and unexpected patterns and relationships in sets of data can be extracte

Normalization database, I need some help with my normalization database hom...

I need some help with my normalization database homework.

Write query to list the staff who work within the branch, Consider the foll...

Consider the following relations: BRANCH( bno, street, area, city, pcode, Tel_no, Fax_no) STAFF( Sno, Fname, Lname, address, position , salary, bno) Express the subsequent qu

Transaction, average response time?

average response time?

Explain the terms data warehousing and data mining, Question: i) Explai...

Question: i) Explain the terms data warehousing and data mining. ii) Discuss the importance of the following security principles that a digital firm should amongst others, n

Design and building a distributed information system, prototype of a distri...

prototype of a distributed information system for a national car part retail outlet chain.

Sequences-data control, Sequences Sequences: Automatically produ...

Sequences Sequences: Automatically produce unique numbers Are sharable Are typically used to make a primary key value Replace application code Speed up t

Define cardinality and participation constraints, Define cardinality and pa...

Define cardinality and participation constraints on a relationship type, completeness constraint on generalization. Ans: Cardinality defines the number of entities to wh

Insertion anomaly-data redundancy, Insertion Anomaly: Inability to show ce...

Insertion Anomaly: Inability to show certain information-The primary key of the over relation be (enrolment number, Cno). Any new tuple to be inserted in the relation should have

Problems of concurrent transactions-lost updates, Lost Updates : Suppose th...

Lost Updates : Suppose the two transactions T3 and T4 run simultaneously and they happen to be interleaved in the following way (suppose the initial value of X as 10000):

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages