Transcript
Data Modeling
March-2005 Data Modeling | 2.15.02
Objectives
• The participants will be able to :– Explain Data Modeling– Know uses of Data Modeling– Describe the Basic Components of a Data Model– Know Data Modeler/ABAP Dictionary Terminology– Know about Optionality and Cardinality– Use SAP Graphic Notation and SAP Text Notation– Explain Data Model Hierarchies and the SAP EDM– Link a data model to dictionary objects
March-2005 Data Modeling | 2.15.02 2
What is Data Modeling?
March-2005 Data Modeling | 2.15.02 3
Data Dictionary
Real World
DataDataDictionaryDictionary
Data Model
Uses of a Data Model
March-2005 Data Modeling | 2.15.02 4
Basic Components of a Data Model
March-2005 Data Modeling | 2.15.02 5
EntityEntityCustomer
AttributeAttribute
30 S. 17th St.
Entity TypeEntity Type
Order
Entity
March-2005 Data Modeling | 2.15.02 6
Customer
Order
Product
Attribute
March-2005 Data Modeling | 2.15.02 7
J. ElkinsJ. Elkins
Customer30 S. 17th St.30 S. 17th St.30 S. 17th St.30 S. 17th St.
215-555-8000215-555-8000215-555-8000215-555-8000
Entity Type
March-2005 Data Modeling | 2.15.02 8
Order
CustomerProduct
Data Modeler / ABAP Dictionary Terminology
Data Modeler ABAP Dictionary
Customer: entity recordCustomer address: attribute fieldCustomers: entity type table
March-2005 Data Modeling | 2.15.02 9
Relationships between Entities
March-2005 Data Modeling | 2.15.02 10
Customer
Order
Cardinality
March-2005 Data Modeling | 2.15.02 11
One - to - Many
Many - to - ManyOne - to - One
Many-to-Many Relationships
March-2005 Data Modeling | 2.15.02 12
Order
Order Lines
1 1 A26Order # Qty
Part #
1 3 C589
2 1 A26
Primary Key: Order Number
Primary Key: Product Number
Primary Keys: Order Number Product Number
Optionality
March-2005 Data Modeling | 2.15.02 13
?
Customer Order
?Customer
Referenced and Dependent Entity Types
March-2005 Data Modeling | 2.15.02 14
Dependent Entity Type
Referenced Entity Type
Customer ID Name Address . . .
Order ID Date of Order Customer ID . . .
Customer
Order
Referenced
Dependent
SAP Graphic Notation
March-2005 Data Modeling | 2.15.02 15
Example Using Graphic Notation
March-2005 Data Modeling | 2.15.02 16
Customers Orders
Practice Using Graphic Notation I
March-2005 Data Modeling | 2.15.02 17
Professors
Students
Practice Using Graphic Notation II
March-2005 Data Modeling | 2.15.02 18
Professors
Students
Practice Using Graphic Notation III
March-2005 Data Modeling | 2.15.02 19
StudentsEnrolmentRecords
Courses
SAP Graphic Notation with Text Notation
March-2005 Data Modeling | 2.15.02 20
1
C
N
CN
SAP Text Notation
March-2005 Data Modeling | 2.15.02 21
1
C
N
CN
1
C
N
CN
1
C
1
C
n n : : m mn n : : m m
Example Using Text Notation
March-2005 Data Modeling | 2.15.02 22
Customers Orders
1 CN:
Practice Using Text Notation I
March-2005 Data Modeling | 2.15.02 23
Students
Professors
:
Practice Using Text Notation II
March-2005 Data Modeling | 2.15.02 24
Students
Professors
:
Practice Using Text Notation III
March-2005 Data Modeling | 2.15.02 25
StudentsEnrolmentRecords
Courses
:
Category
March-2005 Data Modeling | 2.15.02 26
Referential
Hierarchical
Aggregating
?
Conditional-Referential
Specialisation
Relationship Category: Hierarchical
March-2005 Data Modeling | 2.15.02 27
Department
Key:Department Number
Course
Key:Department Number
Course Number
Relationship Category: Aggregating
March-2005 Data Modeling | 2.15.02 28
Student
Key:Student ID Number Enrollment Record
Key:Student ID Number
Course NumberCourse
Key:Course Number
Relationship Category: Referential
March-2005 Data Modeling | 2.15.02 29
Department
Key: Department Number
Professor
Key:Professor Number
Relationship Category: Conditional-Referential
March-2005 Data Modeling | 2.15.02 30
Department
Key: Department Number
Professor
Key:Professor Number
Relationship Category: Specialization
March-2005 Data Modeling | 2.15.02 31
Business Customer
Key:ID Number
Customer
Key:ID Number
Data Model Hierarchies and the SAP EDM
March-2005 Data Modeling | 2.15.02 32
GeneralAccounting
Chart ofAccounts Currency
FI
. . .
.
.
.
.
.
.
Linking a Data Model to ABAP Dictionary Objects
March-2005 Data Modeling | 2.15.02 33
DataDataDictionaryDictionary
Data Model
Summary•A data model is a graphical representation of the information that is to be stored and processed by a system.
•SAP comes with its own data model, called the Enterprise Data Model (EDM), that describes the data design of the SAP system.
•The basic components of a data model are Entities, Attributes & Entity types.
•The cardinality of a relationship describes the number of entities of one type that relate to entities of other types.
•The optionality of a relationship describes whether or not entities of one type must refer to entities of another type.
•Data models in SAP can be organised hierarchically.•The SAP Data Modeler is integrated with the ABAP Dictionary.
March-2005 Data Modeling | 2.15.02 34
Questions
•What is a data model ?•What is SAP's data model called ?•What are the basic components of a data model ?
March-2005 Data Modeling | 2.15.02 35
top related