der the fonowing felation. Computer_Repair(Comp_ID, Engineer_ID, Customer_name, Engineer_Name, Date_Assigned, Date_Repaired, Issue, Priority_Level, Service_Charge, Commission_Percentage, Total_Repairs) The primary key of the relation is underlined The relation has the following additional functional dependencies: FD1: Engineer_ID Engineer_Name, Total_Repairs, Commission_Percentage FD2: Comp_ID → Customer_name, Issue, Priority_Level, Service_Charge FD3: Priority_Level → Service_Charge FD4: Total_Repairs Commission_Percentage i. Give reasons to explain if this is in 1NF or not. If not, decompose it to 1NF. ii. Give reasons to explain if this is in 2NF or not. If not, decompose it to 2NF. iii. Give reasons to explain if this is in 3NF or not. If not, decompose it to 3NF.

der the fonowing felation. Computer_Repair(Comp_ID, Engineer_ID, Customer_name, Engineer_Name, Date_Assigned, Date_Repaired, Issue, Priority_Level, Service_Charge, Commission_Percentage, Total_Repairs) The primary key of the relation is underlined The relation has the following additional functional dependencies: FD1: Engineer_ID Engineer_Name, Total_Repairs, Commission_Percentage FD2: Comp_ID → Customer_name, Issue, Priority_Level, Service_Charge FD3: Priority_Level → Service_Charge FD4: Total_Repairs Commission_Percentage i. Give reasons to explain if this is in 1NF or not. If not, decompose it to 1NF. ii. Give reasons to explain if this is in 2NF or not. If not, decompose it to 2NF. iii. Give reasons to explain if this is in 3NF or not. If not, decompose it to 3NF.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Consider the following relation: Invoice(Order_ID, Order_Date, Customer_ID, Customer_Name,Customer_Address,Product_ID, Product_Desc, Price, Order_Quantity) FD1 - Order_ID -> Order_Date, Customer_ID, Customer_Name, Customer_Address FD2 - Customer_ID -> Customer_Name, Customer_Address FD3 - Product_ID -> Product_Description, Price FD4 - Order_ID, Product_ID -> Order_Quantity Give reasons to explain if this is in 3NF or not. If not, decompose it to 3NF.
Consider the relation schema R (A, B, C, D) with all possible functional dependencies. For each of the following situations, identify the highest normal form for this relation R. A, C -> B, D C -> D A, C -> B, D B -> D A, C -> B, D
Consider the following relation: Invoice(Order_ID, Order_Date, Customer_ID, Customer_Name,Customer_Address,Product_ID, Product_Desc, Price, Order_Quantity) FD1 - Order_ID -> Order_Date, Customer_ID, Customer_Name, Customer_Address FD2 - Customer_ID -> Customer_Name, Customer_Address FD3 - Product_ID -> Product_Description, Price FD4 - Order_ID, Product_ID -> Order_Quantity What are the candidate keys of this relation? Give reasons to explain if this is in 1NF or not. If not, decompose it to 1NF. Give reasons to explain if this is in 2NF or not. If not, decompose it to 2NF. Give reasons to explain if this is in 3NF or not. If not, decompose it to 3NF.
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.
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
Consider the following relation with set of functional dependenciesR(ABCDEF)ABC->D, ABD->E, CD->F, CDF->B, BF->Da) Identify the candidate key(s) in the relation with proper steps followed. Explain in detail b) Identify which normal form this relation is in and reason for the answer. Explain in detail Please answer these question in detail with full steps. I need a proper long answer. Thanks
Consider the following relation with functional dependencies as shown below. R{sno, sname, age, cno, cname, group) R(A, B, C, D, E, F) Divyansh sharma AB, C C F D-E In which normal form is the relation R is in ? (A) First normal form (B) Second normal form (C) Third normal form (D) Boyce Codd normal form
Question 1: Normalization PLEASE WRITE ELIGIBLE AND SHOW FULL STEPS FOR DIAGRAM TO DECOMPOSE Consider a relation X with six attributes WYSMFE where WS is a composite primary key for X. Assume X has the following functional dependencies (X is one table with the attributes W, Y, S, M, F, E): WS è YMFE S è YME E è M Is it possible to decompose X into a number of relations in order to achieve a higher normal form? Explain how (this means using English sentences and a diagram showing the final relation(s)).
Convert the ER diagram to relations in the normal manner to capture as many constraints as possible, and then identify which of the answers is a relation schema. A. Dependents(ID, name, bDate) B. Employees(ID, name, street, city, state, phones, sDate, lengthEmp) C. Coverage(ID, name) D. Employees(ID, name, street, city, state, sDate, lengthEmp)
Given:1. The universal relation schema Q(CTHRSG), where C = course, T = teacher, H = hour, R = room, S= student, and G = grade.2. The minimal set of functional dependencies F are assumed: C ->T each course has one teacher HR -> C only one course can meet in a room at one time. HT -> R a teacher can be in only one room at one time. CS -> G each student has one grade in each course. HS -> R a student can be in only one room at one time. 3. The decomposition of the universal schema Q(CTHRSG) based on the algorithm (Lossless Join and Dependency-Preserving Decomposition into 3NF Relation Schema) is:D = {R1, R2, R3, R4, R5}, where R1 = {CT} R2 = {HRC} R3 = {HTR} R4 = {CSG} R5 = {HSR} 4. HS is the key of R, and is a part of R5. Please apply the Lossless Join Testing algorithm to see if the decomposition D is a lossless join decomposition. Please provide testing details step by step when you apply the set of functional dependency for testing.
Functional Dependencies and Normalization Exercise 1: Consider the following relation: Stock(#prod, #dep, pname, quantity) Determine the functional dependencies on Stock. For each of them, explain what they mean in plain English. Is Stock 3NF? Is Stock BCNF? Exercise 2: Consider the following relation: Plane(#plane, type, constructor, capacity, owner) Determine the functional dependencies on Plane. For each of them, explain what they mean in plain English. Is Plane 3NF? Is Plane BCNF? Exercise 3: Compute the attribute closure of XZA with respect to the following set of dependencies: F = {XZ => ZYB, YA -> GC, C -> W, B -> G, XZ -> G} Is the dependency XZA -> YB implied by F? Hint: Use the Armstrong axioms. Exercise 4: What are the properties of the BCNF decomposition algorithm? Explain lossless and dependency preservation with your own words. Apply the decomposition algorithm on Stock.
Question 6. Consider the following relation: Invoice(Order_ID, Order_Date, Customer_ID, Customer_Name,Customer_Address,Product_ID, Product_Desc, Price, Order_Quantity) FD1 - Order_ID -> Order_Date, Customer_ID, Customer_Name, Customer_Address FD2 - Customer_ID -> Customer_Name, Customer_Address FD3 - Product_ID -> Product_Description, Price FD4 - Order_ID, Product_ID -> Order_Quantity What are the candidate keys of this relation? Give reasons to explain if this is in 1NF or not. If not, decompose it to 1NF. Give reasons to explain if this is in 2NF or not. If not, decompose it to 2NF. Give reasons to explain if this is in 3NF or not. If not, decompose it to 3NF.