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.
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Chapter 3 Solutions
Database Systems: Design, Implementation, & Management
- We need to create a database for the Circulation Department of a public library. The database will store information about the patrons, books, and circulation. It contains the following: 4 tables for the database: PATRON, BOOK_COPY, BOOK, and CHECKOUT. (Since a book may have multiple copies that may be purchased by the library at different time, it is better to have a BOOK_COPY table to avoid unnecessary data redundancy.) The data in the tables are as follows: PATRON table records a patron’s ID, name, address, phone number, and email address. BOOK table contains information such as author, title, publication date, subject, language, and a unique identifier (It can be the ISBN of the book) for each book. BOOK_COPY table records a unique identifier for each copy of a book, the date of purchase, and the identifier of the book from the BOOK table. CHECKOUT table records the date of check-out, patron’s ID, the…arrow_forwardHow can you implement 1:M relationship in a database composed of two tables ? Explain with example.arrow_forwardWrite a Java or PHP program that connects to a MySQL database and fetches all records from the Doctor relation (see appendix) and prints out the records in tabular form, with appropriatenames as column headings.arrow_forward
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- ER 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_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_forward
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