A database is a structure that is used to hold data and it referred as a systematic collection of data.
Table:
A table is a logical structure that represents an entity state. It is one of the components of database.
One-to-Many Relationship:
When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one to many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship.
Crow Foot ERD:
The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.
Trending nowThis is a popular solution!
Chapter 3 Solutions
Database Systems: Design, Implementation, & Management
- The CVT Company is a leader in the manufacture of work clothes. You are hired as database administrator for the company and your IT supervisor asked you to solve a retrieval speed problem they used to have with a large file for item records. Your supervisor mentioned that they have sorted the file but the problem didn’t improve, so they need to create a B+ tree index to solve the problem. Your supervisor outlined the way to do it: “The best way to accomplish this task is to scan the file, record by record, inserting each one using the B+ tree insertion procedure.” Being a fresh graduate, you noticed that since the file is already sorted there is a better way to do it. What performance and storage utilization problems are there with your supervisor’s approach? Explain how the bulk-loading algorithm provides a better alternative than the proposed scheme.arrow_forwardNeed a c++ program to connect to this database and perform add, search, remove, display operations. -- students create table students ( student_id int, name varchar(50), dob date, phone int, email varchar(50), address text, year_level int, section varchar(2), primary key(student_id) ); -- staff create table staff(staff_id int,name varchar(50),address text,phone int, email varchar(50),position varchar(20),salary int,primary key(staff_id) ); -- book_subject create table( subject_id int primary key, subject varchar(50)); -- books create table books( book_id int,title varchar(50),published_year int,isbn int,cost int, subject_id int, primary key(book_id),foreign key(subject_id) references book_subject(subject_id) ); -- book_issue create table book_issue( issue_id int, issue_date date, staff_id intjumb, student_id int, book_id int, return_date da primary key(issue_id), foreign key(staff_id) references…arrow_forwardDraw an ER model; An author writed a book . Every book has a title, ISBN, year, and price. each book may be authored by one or more author and each author may write one , or more than one book. For authors the database keeps the name, address and URL of their homepage. Each book has a publisher. The database keeps the name, address , and phone number adn the URL of their wedbsite. Each publishers publishes one or more books and each book is published by exactly one publisher. The warehouse stocks several books. Each warehouse has a code, address and phone number. The database records the number of copies stocked at various warehouse.arrow_forward
- Assumptions: You can make the following assumptions in this project. The database stores information about houses, each with a house ID, address, and zip code. The database stores information about person, including person ID, house ID where the person lives, person name, phone number, and status where 1 means currently tested positive (i.e., the most recent test result is positive), 0 means currently tested negative (i.e., the most recent test result is negative), and null (no test so far so status is unknown). The database stores information about a person's all past tests, including person ID, test date, and result (1 means positive and 0 negative). The database stores information about events (could be gathering, party, etc.). Each event has an event ID, event name, date, and address. The database stores information about a person participated in an event. The database stores information about flights, including flight ID, flight date, flight number (a varchar type e.g.,…arrow_forwardA manager has a list of items that have been sorted according to an item ID. Some of them are duplicates. She wants to add a code to the database that assigns a 1 to the item if it is unique, and if there are duplicates, assigns the number of the duplicate. An example is shown below. The first two items are unique, so the repeat code is 1. However, Item ID 37695 is listed six times, so the codes are assigned from 1 to 6, and so on. Explain how to assign the correct code using an IF statement Item ID Repeat Code35080 135222 137695 137695 237695 337695 437695 537695 637712 137722 137757 137757 2 In cell B2 enter 1, and then type a formula into cell B3, followed by dragging the formula down column B until it aligns with the last row in the Item ID column. Which of the following is the correct formula to type into cell B3?arrow_forwardConsider the following scenario: there is only one vacant slot in a class and two students want to enroll. Which aspect of a database prevents them from sharing a single seat?arrow_forward
- In the case of a physical database, where do you begin?arrow_forwardER Modeling Suppose you are given the following requirements for a simple database for the National Hockey League (NHL): The NHL has many teams Each team has a name, a city, a coach, a captain, and a set of players Each player belongs to only one team Each player has a name, a position (such as left wing or goalie), a skill level, and a set of injury records A team captain is also a player A game is played between two teams (referred to as host_team and guest_team) and has a date (such as May 11th, 1999) and a score (such as 4 to 2). Draw the ER diagram to represent the above scenarioarrow_forwardTo access a database, we need to open a connection to it first and close it once our job is done. Connecting to a database depends on the type of the target database and the database management system (DBMS). For example, connecting to a SQL Server database is different from connecting to an Oracle database. But both these connections have a few things in common: •They have a connection string •They can be opened•They can be closed•They may have a timeout attribute (so if the connection could not be opened within the timeout, an exception will be thrown).Your job is to represent these commonalities in a base class called DbConnection. This class should have two properties: ConnectionString : stringTimeout : TimeSpanA DbConnection will not be in a valid state if it doesn’t have a connection string. So you need to pass a connection string in the constructor of this class. Also, take into account the scenarios where null or an empty string is sent as the connection string. Make sure to…arrow_forward
- WRITE THE OF MYSQL IN PYTHON, JUST ANSWER THE 2ND QUESTION BY LOOKING AT THE FIRST QUESTION Create database and tables as given below by using Python. (a) Market database (b) Vendor: vendor id integer, vendor name varchar, license start date, license end date (c) Item:itemidinteger,itemnamevarchar,itemtypevarchar, previous price float, last sold date date (d) Auction: auction id integer, vendor id integer, item id integer, price float Choose primary and foreign keys depending on the relations in Market database design. Create arrays of at least 5 di↵erent records. Use these arrays to populate each table in the database.arrow_forwardImagine a database of students where the StudentID is the main key, and there are other indexes on Major, Age, Marital Status, and HomeZipCode (all secondary keys). Let's assume the institution wanted a list of MIS or computer science majors who were over 25 and married and were from the 45462 postcode code OR computer engineering majors who were single and were from the 45462 zip code. In any case, they wanted the list to come from the 45462 zip code. How can indexes be used to guarantee that individuals will only have access to the info that fulfills this prerequisite?arrow_forwardProblem: implement database in MySQL for music(table: artist, album, track , played) and add multiple join operation, nested query and add any other 2 queriesarrow_forward
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education