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1: Database Fundamentals
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11 Which of the following is true regarding the object-relational model A It serves only a niche market and most experts believe it will stay that way B Records are connected using physical address pointers C It was developed by adding object-like properties to the relational model D It was developed by adding relational-like properties to the object-oriented model 12 According to advocates of the relational model, which of the following describe the
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A It is too mathematical B It is too complicated C Set-oriented queries are too difficult D It has no formal underpinnings in mathematical theory 13 According to advocates of the CODASYL model, which of the following describe the
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A It is too mathematical B Set-oriented queries are too difficult C Application systems need record-at-a-time processing D It is less efficient than CODASYL model databases 14 The ability to add a new object to a database without disrupting existing processes is
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15 The property that most distinguishes a relational database table from a spreadsheet is
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Exploring Relational Database Components
Databases: A Beginner s Guide
Key Skills & Concepts
Conceptual Database Design Components Logical/Physical Database Design Components
his chapter explores the conceptual, logical, and physical components that make up the relational model Conceptual database design involves studying and modeling the data in a technology-independent manner The conceptual data model that results can be theoretically implemented on any database or even on a flat file system The person who performs conceptual database design is often called a data modeler Logical database design is the process of translating, or mapping, the conceptual design into a logical design that fits the chosen database model (relational, object-oriented, object-relational, and so on) A specialist who performs logical database design is called a database designer, but often the database administrator (DBA) performs all or part of this design step The final design step is physical database design, which involves mapping the logical design to one or more physical designs, each tailored to the particular DBMS that will manage the database and the particular computer system on which the database will run The person who performs physical database design is usually the DBA The processes involved in database design are covered in 5 The sections that follow explore the components of a conceptual database design, and then the components of logical and physical designs
Conceptual Database Design Components
Figure 2-1 shows the conceptual database design for Northwind This diagram is similar to Figure 1-7 in 1, but a few items have been added to illustrate key points The labeled items (Entity, Attribute, Relationship, Business Rule, and Intersection Data) are the basic components that make up a conceptual database design Each is presented in sections that follow, except for intersection data, which is presented in Many-to-Many Relationships
Entities
An entity (or entity class) is a person, place, thing, event, or concept about which data is collected In other words, entities are the real-world things in which we have sufficient interest to capture and store data about in a database An entity is represented as a rectangle
2: Exploring Relational Database Components
Entity Attribute
Customer Customer ID Company Name Address City State / Province Country / Region Business Phone Order Order ID Note: Customers with overdue amounts may not book new orders Customer ID (FK) Employee ID (FK) Order Date Shipped Date Ship Address Ship City Shipping Fee
Account Receivable Account Number Credit Score Balance Due Due Date Overdue Amount Customer ID (FK)
Relationship
Employee Employee ID Last Name First Name Job Title
Business Rule
Product Product ID Intersection Data Unit Price Quantity Discount Product Name Product Code Description List Price Quantity Per Unit Category
Figure 2-1
Conceptual database design for Northwind
on the diagram Just about anything that can be named with a noun can be an entity However, to avoid designing everything on the planet into our database, we restrict ourselves to entities of interest to the people who will use our database Each entity shown in the conceptual model (Figure 2-1) represents the entire class for that entity For example, the Customer entity represents the collection of all Northwind customers The individual customers are called instances of the entity An external entity is an entity with which our database exchanges data (sending data to, receiving data from, or both) but about which we collect no data For example, most businesses that set up credit accounts for customers purchase credit reports from one or more credit bureaus They send a customer s identifying information to the credit bureau and receive a credit report, but all this data is about the customer rather than the credit bureau itself Assuming there is no compelling reason for the database to store data about
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