A relation r(A, B, C) had multi-valued dependencies among all its attributes. It was decomposed for achieving a better database as follows r1(A, B) r2(B, C) r3(C, A) This is an example of what kind of normalization?
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- A relation r(A, B, C) had multi-valued dependencies among all its attributes. It was decomposed for achieving a better database as follows: г1(А, В) г2 (В, с) r3(С, А) This is an example of what kind of normalization? DKN PJNF BCNF 4NFMap the relational schema of Figure 6.14 into an ER schema. This is part of a process known as reverse engineering, where a conceptual schema is created for an existing implemented database. State any assumptions you make. ВOOK Book id Title Publisher_name BOOK AUTHORS Book id Author_name PUBLISHER Name Address Phone воOK COPIES Book id Branch_id No of_copies BOOK LOANS Book_id Branch_id Card no Date_out Due_date LIBRARY_BRANCH Branch_id Branch_name Address BORROWER Card no Name Figure 6.14 A relational database Address Phone schema for a LIBRARY database.Consider the following database schema for University Library database. A student can borrow many books and a given book can be borrowed by any student if it is available in the library. For each borrowing, the borrowing and return dates are registered in the database. Student (SID: long, CPR:long (unique), Name:string, tel:number, major:String, gender:Character {'F' or 'M'}) Book (ISBN:long Title:string (unique), Author:string) BorrowedItems(stSID:long, book|SBN:long, serialNo:int (unique), BorrowingDate:date, ReturnDate:date) Write SQL statements to: 1. List ISBN, Title, Author of all books that include the word 'Database' in their titles in a descending order of ISBN. 2. List SID, Name, and Major of all female students doing major in CS'and their name starts with 'S'. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).
- Here's a relation (R), its attributes and its functional dependencies (F): R(A, B, C, D, E, F, G) BC -> DG CD -> F FG -> A 1. compute the closure of {ACD}+ 2. compute the closure of {F}+ 3. what are the keys of R?Random Hospital Example ERD Problem Follow the Simple Procedure for ERD diagramming to design an ERD using the following user provided information. Remember the ERD will eventually turn into the design for a database from a top down view. Make sure you resolve any many to many conflicts. Label an identifier or primary key and all pertinent attributes given. If an attribute is not readily apparent from the user information, then make one up that makes sense for the particular entity. Therefore, all entities should end up with at least an identifier and another attribute that makes sense. You may use any of the approaches shown by the book, though the ER-Model and Crow’s foot are the most common. Make sure you show entities, relationships, cardinality, and optionality. Random Hospital Example A hospital has 10 wards, each containing up to 20 patients. Patients have only one doctor allowed to prescribe drugs for them. Doctors do their rounds once a day and prescribe drugs by…Suppose you are given the following business rules to form the basis for a database design. The database must enable the manager of a company dinner club to mail invitations to the club’s members, to plan the meals, to keep track of who attends the dinners, and so on. Each dinner serves many members, and each member may attend many dinners. A member receives many invitations, and each invitation is mailed to many members. A dinner is based on a single entree, but an entree may be used as the basis for many dinners. For example, a dinner may be composed of a fish entree, rice, and corn. Or the dinner may be composed of a fish entree, a baked potato, and string beans. A member may attend many dinners, and each dinner may be attended by many members. Because the manager is not a database expert, the first attempt at creating the database uses the structure shown in Table I: Table I Sample RESERVATION Records Attribute Name Sample Value Sample Value Sample Value…
- Suppose you are given the following business rules to form the basis for a database design. The database must enable the manager of a company dinner club to mail invitations to the club's members, to plan the meals, to keep track of who attends the dinners, and so on. Each dinner serves many members, and each member may attend many dinners. A member receives many invitations, and each invitation is mailed to many members. A dinner is based on a single entree, but an entree may be used as the basis for many dinners. For example, a dinner may be composed of a fish entree, rice, and corn, or the dinner may be composed of a fish entree, a baked potato, and string beans. Because the manager is not a database expert, the first attempt at creating the database uses the structure shown in Table P6.7.a. Given the table structure illustrated in Table P6.7, write the relational schema and draw its dependency diagram. Label all transitive and/or partial dependencies. (Hint: This structure uses a…DATABASE SYSTEM A relation R is given which is R(A,B,C,D,E). It has the following functional dependencies: BC -> ADE , D -> B. Answer the following based on this information. Which normal forms does this relation satisfy? Which type of dependencies does this relation violate? Normalize the relationship so that it decomposes to 3NF.Problem 2: A database for maintaining information about the cities in the United States has the following relation schema Info(city_name, state, governor, mayor) The city_name attribute is the name of a city, state is the abbreviation for state the city is in, governor is the name of the governor of the state the city is in, and mayor is the name of the mayor of the city. For example, the tuple ('New York', 'NY', 'Andrew Cuomo', 'Bill de Blasio') gives information about New York City. Two cities may have the same name (for example there are at least two cities named Portland in the US), but two cities in the same state cannot have the same name. Two states cannot have the same abbreviation. Each city has exactly one mayo and each state has exactly one governor. 1. Which of the following are super keys? Which are candidate keys? (There may be more than one): {city_name} {state} {city_name, state} {city_name, state, mayor} 2. If there are 1000 cities from NY state in a relation of this…
- Read the scenario carefully You have to propose and optimal database design in RDBMS for a super store. In which clients came and can purchase products according to their likes and dislikes. Super store have same products of different companies. In the end client received a receipt of their purchase from counter he/she go for bill. Database also save records of stock according to FIFO system.Your required to define1) Entities and their attributes2) Attributes Types 3) Each Attribute Required space.4) Define keys of each entity 5) Defile relationship between the entities.Consider the Relation R4 = (A,C,B,D,E,F), with Functional Dependencies: A -> B, C -> D, E -> D. What is the Candidate Key for R4?DATABASE SYSTEM A relation R is given which is R(A,B,C,D,E). It has the following functional dependencies: BC -> D, AC -> BE, B->E . Answer the following based on this information. What is the candidate key of this relation? Is it in 2NF? Explain why or why not.