5 Consider the following relational schema and the listed functional dependencies.R = (A, B, C, D){BAC, C → D}For each of the questions, first list the answer, and then give a brief reasoning.(a) List a candidate key.(b) Is the relation in 3NF? Why or why not? List one FD that violates it if it is not.(c) Decompose the relation into 3NF if it is not already in it.

Here in this question we have given a relation with some FDs and we have asked to answer some…

Consider the following relational schema and the listed functional de R = (A, B, C, D) {BAC, C D} For each of the questions, first list the answer, and then give a brief r (a) List a candidate key. (b) Is the relation in 3NF? Why or why not? List one FD that violates (c) Decompose the relation into 3NF if it is not already in it.

Consider the following relational schema and the listed functional de R = (A, B, C, D) {BAC, C D} For each of the questions, first list the answer, and then give a brief r (a) List a candidate key. (b) Is the relation in 3NF? Why or why not? List one FD that violates (c) Decompose the relation into 3NF if it is not already in it.

Database Systems: Design, Implementation, & Management

12th Edition

ISBN:9781305627482

Author:Carlos Coronel, Steven Morris

Publisher:Carlos Coronel, Steven Morris

Chapter8: Advanced Sql

Section: Chapter Questions

Problem 18RQ

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Consider the unnormalized relation R with six attributes ABCDEF and the following functional dependencies:AB ->CDEB -> FC -> Da) What is the key(s) for the relation?b) What is the normal form of this relation? Explain it.c) Decompose R into 3NF relations step by step if it is not in 3NF.
Suppose you have a Relation that has an atomic Primary Key and noRepeating Groups. All non-key columns are functionally dependent on the Primary Key, but it has a Transitive Functional Dependency. How would you resolve this Transitive Functional Dependency? you would create a 1:M relationship between the initial table and a new table and place the columns that are Transitively Functionally Dependent on the many side. You would move the columns that are Transitively Functionally Dependent to a parent table. The column they were Transitively Functionally Dependent on serves as the Foreign Key to the parent table Transitive Functional Dependencies can only exist with a Composite Primary Key and the, therefore, can;t exist in the table as it has an atomic Primary Key. You would move the column that are Transitively FUnctionally Dependent to a child table. The column they were Transitively Functionally Dependent on serves as the Primary Key to the child Table
Consider the following relation: r (A1, A2, A3). For all the states of the relation, the result of Query #1 is always the same as that of Query #2. Specify the primary key of the relation r (30 points); Explain why it must be the primary key.Query #1: sr1.A2=r2.A2 Ù r1.A1=r2.A1 (rr1 (r) ´ rr2 (r))Query #2: select *from r as r1, r as r2where r1.A1=r2.A1
Question 1 Suppose you are given a relation R = (A, B, C, D, E) with the following functional dependencies: C, E >D D-B CA a) Find all candidate keys. b) If the relation is not in BCNF, decompose it until it becomes BCNF, At each step, identify a new relation, decompose and re-compute the keys and the normal forms they satisfy.
Given the following relation: R(A, B, C, D, E, F, G) The functional dependencies that apply onto R are: AB> G B>E,F G>A A> CD 1. What normal form is the relation in? Why? 2. How would you successively normalize it completely? State the reason behind each decomposition step by step.
The text states that you can argue that “the only reason for having relations is to store instances of functional dependencies.” Explain, in your own words, what this means
For relation (R), its attributes and its functional dependencies (F): R(A, B, C, D, E) C D → B A → D E → C 1. Decompose the above relation using the Boyce-Codd Normal Form (BCNF) decomposition. 2. What is the key for the relation R?
just answer true/false a]Disjointness means that every entity of a supertype must be an entity in one of the subtypes in the generalization hierarchy. b]Record is a set of more fields that describe a person, place or thing. c]Cardinality is the number of tuples in a relation. d]Referential integrity must have null values only.
For each one of the domain specification given below, identify all the functional dependencies, and its highest normal form. Remember that the identification of a normal form requires analysis of the valid functional dependencies and the minimal keys. Provide justification of each answer. A solution with no comprehensive justification scores no marks. 2. In a higher education institution, in a semester, students are allowed to enroll up to 2 running subjects, and each running subject may have many students enroll to it. The final grade the students receive for a subject, and the credit value of each subject are recorded in the following relational table. ENROLMENT(StdNum, SubNum, Grade, CreditValue) 3. When a staff is required to undertake an inspection of properties, the staff is allocated a company car for the day. A staff may inspect several properties on a given date, and a property is only inspected once on a given date. This information of the inspection are stored in the…
Normalize the following given data to 1/2/3 NF. State the relations schema after everynormalization.
Q7. Consider a database containing two relations: R(A,B,C) and S(D,E,F). For each of three (your choice) of the 12 rewriting rules for relational algebra expression, give an example pair of relational algebra expressions involving R and S such that the rule rewrites one expression to the other expression, and give another example pair to show the rewriting rule cannot be used since some of the conditions for the rule are not satisfied.
Consider the below given statements: 1. Referential integrity constraints are always specified between two entities in a schema. 2. Referential integrity constraints are always specified between entities having recursive relation. Which of the above statements is incorrect?

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