Consider the relations section and takes. Give an example instance of these two relations, with three sections, each of which has five students. Give a file structure of these relations that uses multitable clustering.
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Consider the relations section and takes. Give an example instance of these
two relations, with three sections, each of which has five students. Give a file
structure of these relations that uses multitable clustering.
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- Integrate any programming language to mySQL with the implementation of Database Normalization and Creation of ER Model. What should I expect? 1. User login interface 2. An interface where I can input my details. (User registration form, Freshman Application Form, Credit Card Application Form, Bank Account Opening Form, and etc.) These are just samples, you can think of your own, of course. 3. From one whole big interface of registration form or any above-mentioned items, I should see the database normalization implemented from whole big table (1NF) to 3NF. The expectation is that the database should have 1NF table and lastly the 3NF tables.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).Is it possible to utilize two clustering indices for different search keys on the same relation in general? Describe how you arrived at your conclusion.
- Suppose we have the table Employee[id, name, supervisor] This table implements an employee entity type and the relationship "a person has a supervisor", similar to the Company database. Even if we have referential integrity it is possible for us to have corrupt data. Consider two cases: • we could have data where an employee is their own supervisor (last row below), or • where the supervisor of A is B but B shows its supervisor to be A (first two rows belov. id supervisor A B C D name John Joyce Jim Jennifer Peter null Write an SQL statement to list any rows with the type of bad data as outlined in the above.Describe the concept of "lazy loading" in the context of database connectivity.Consider the schemas for the table people, and the tables students and teachers, which were created under people, in Section 8.2.1.3. Give a relational schema in third normal form that represents the same information. Recall the constraints on subtables, and give all constraints that must be imposed on the relationalschema so that every database instance of the relational schema can also be represented by an instance of the schema with inheritance.
- 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 4NFLet the database has two relations P(a, b) and Q(m, a, n) in which a is the primary key of the relation P and m is the primary key of the relation Q. Instance of P has 70 Tuples and Instance of Q has 42. What is the maximum number of rows in the new instance produced by P Q? ( is natural join)The database interface of a library allows searching only for a single attribute (such as „Title. or Author.) in each query. Your friend decided to extend it's functionality and wrote an algorithm that allows searching for books that satisfy multiple predicates over single attributes in conjunction. He tells you the algorithm reuses the already implemented query functionality and works by intersecting the results (_book id's.) of queries over single attributes. Which of the following assumptions on your friend's algorithm are plausible? a) Its worst-case run-time necessarily increases exponentially with respect to the number of attributes in the query. b) Its worst-case run-time depends on the length of the longest result of the single-attribute queries. c) It might be implemented using an join. d) It might be implemented using sorting.
- Suppose we have a relational database with five tables. table key Attributes S(sid, A) Sid T(tid, B) Tid U(uid, C) Uid R(sid, tid, D) sid, tid tid, uid Q(tid, uid, E) Here R implements a many-to-many relationship between the entities implemented with tables S and T, and Q implements a many-to-many relationship between the entities implemented with tables T and U. A. Write an SQL query that returns all records of the form sid, uid where sid is the key of an S- record and uid is the key of a U-record and these two records are related through the relations R and Q. Use SELECT and not SELECT DISTINCT in your query. B. Write an SQL query that returns records of the form A, C where the A-value is from an S- record and the C-value is from a U-record and these two records are related through the relations R and Q. Use SELECT and not SELECT DISTINCT in your query. C. Could one of your queries from parts (a) and (b) return more records than the other? If so, which one? Justify your answer. D.…Store the following fields for a library database: AuthorCode, AuthorName, BookTitle, BorrowerAddress, BorrowerName, BorrowerCardNumber, CopiesOfBook, ISBN (International Standard Book Number), LoanDate, PublisherCode, PublisherName, and PublisherAddress. A one-to-many relationship exists between publishers and books. Many-to-many relationships exist between authors and books and between borrowers and books.a. Name the entities for the library database b. Without creating a set of dependency diagrams, write the relational schema that meet 3rd NF requirements. c. Draw the Crow’s Food entity-relationship diagram for the library database.Suppose RR is a relation with attributes A1,A2,…,AnA1,A2,…,An. How many superkeys will RR have if a) The only candidate key is A1A1. b) The only candidate keys are A1A2A1A2 and A1A3A1A3.