Database Foundations. 4-1 Oracle SQL Developer Data Modeler. Copyright 2015, Oracle and/or its affiliates. All rights reserved.

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Jonas Washington
6 years ago
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2 Database Foundations 4-1

3 Road Map You are here Oracle SQL Developer Data Modeler Converting a Logical Model to a Relational Model 3

correct optionality and cardinality Supertype and subtype

4 Objectives This lesson covers the following objectives: Use to create: Entities, attributes, and UIDs with correct optionality and cardinality Supertype and subtype entities Arc, hierarchical, barred, and recursive relationships 4

5 Introduction to Oracle SQL Developer Data Modeler offers a range of data and database modeling capabilities, enabling you to: Capture business rules and information Create process, logical, relational, and physical models Store metadata information in XML files Synchronize the relational model with the data dictionary 5

6 Interface: Example Overview Main Menu Object Browser Display Window Navigator 6

7 Building an ERD by Using Oracle SQL Developer Data Modeler b. Create attributes and UIDs. c. Define relationship between entities. d. Set the source and target values for the relationship. a. Create entities. 7

8 Case Scenario: An Introduction Sean, I would like you to create a simplified library database to manage the number of reference books in our department. As a first step, can you build a logical model using Oracle SQL Developer Data Modeler that we have installed in our student machines? Faculty Glad to. I ll start by identifying the entities and their attributes. After that, I can use the tool to build the logical model. Student 8

9 Case Scenario: Identifying Entities Authors Books Members Publishers Book Transactions 9

10 Building an Entity Relationship Diagram Navigate to the Logical Tab 1 Create an Entity 2 Add Attributes to the Entity 3 Set the Unique Identifiers 4 Define the Relationship Between the Entities 5 10

11 Building an ERD: Step 1 1. Navigate to the Logical tab. 11

12 Building an ERD: Step 2 2. Create an entity. a b 12

13 Building an ERD: Step 3 3. Add attributes to the entity. a b c d e 13

14 Editing the Attribute Properties f g 14

15 Building an ERD: Step 4 4. Set the UID. 15

16 Building an ERD: Step 5 5. Define the relationships between the entities. a b 16

17 Building an ERD: Step 6 6. Set the source and target values for the relationship. a b c d 17

I can create a common entity that would hold membership details that are common to all the three membership categories.

18 Case Scenario: Entity Types Faculty Sean, I was wondering if we could include new types of membership categories such as: Student Membership Faculty Membership Corporate Membership This can definitely be achieved. I can create a common entity that would hold membership details that are common to all the three membership categories. This would be a supertype entity. The specific membership categories would inherit the properties of the supertype entity, in addition to their own specific attributes. Hence, the specific membership category would be a subtype entity. Student 18

19 Creating the Supertype Entity MEMBERS Supertype FACULTY STUDENT CORPORATE Subtype a b 19

20 Creating the Arc Relationship a b 20

21 Creating the Hierarchical Relationship 1:N Relationship 21

22 Creating the Barred Relationship Identifying Relationship 22

23 Creating the Recursive Relationship In a relationship, if the same entity participates more than once, it is termed a recursive relationship. Recursive Relationship 23

24 Summary In this lesson, you should have learned how to: Use to create : Entities, attributes, and UIDs with correct optionality and cardinality Supertype and subtype entities Arc, hierarchical, barred, and recursive relationships 24

Oracle Data Modelling & Database Design Course Content:35-40hours

Oracle Data Modelling & Database Design Course Content:35-40hours Course Outline Introduction to Modeling List the reasons why modeling is important Describe the phases of the Database and Application