DATA MODELING FUNDAMENTALS (P16) pot

... conventions. Data Repository. Storage of the organization’s data in databases. Stores all data values that are part of the databases. Data View. See User View. Data Warehouse. A specialized database ... tables, columns, and so on. Data Integrity. Accuracy and consistency of the data stored in the organization’s data- base system. Data Manipulation. Operations for altering d...

Ngày tải lên: 07/07/2014, 09:20

... Modeling Principles / 34 Data Modeling Approaches and Trends / 35 Data Modeling Approaches / 36 Modeling for Data Warehouse / 38 vii DATA MODELING FUNDAMENTALS DATA MODELING FUNDAMENTALS A Practical ... INTRODUCTION TO DATA MODELING 1 1 Data Modeling: An Overview 3 Chapter Objectives / 3 Data Model Defined / 4 What Is a Data Model? / 5 Why Data Modeling?...

Ngày tải lên: 07/07/2014, 09:20

... an external data model. INFORMATION LEVELS 13 storage. So, who performs data modeling? Data modeling specialists with appropriate training, knowledge, and skills do the work of data modeling. However, ... ideas with particular emphasis on data modeling. Where does data modeling fit in the whole process? What purposes does it serve and what is its significance? Data modeli...

Ngày tải lên: 07/07/2014, 09:20

... of data models: external data model, conceptual data model, logical data model, and physical data model. We also reasoned out the need for these four types of data models. The four types of data ... group. Logical Data Model. The logical data model brings data modeling closer to implemen- tation. Here the type of database system to be implemented has a bearing on the con...

Ngày tải lên: 07/07/2014, 09:20

... a logical data model. In our case, the relational data model is the logical data model. Note the following major components of a conceptual data model and a relational data model. E-R Data Model Entity ... DETAIL CHAPTER SUMMARY . Data models created at the four information levels in an organization: external data model, conceptual data model, logical data model, and physi...

Ngày tải lên: 07/07/2014, 09:20

... relationship, in a conceptual data model diagram you can show these two entity types and mark their relationship as many-to-many. In a data model at the con- ceptual data model, expressing many-to-many ... time-dependent data elements and that your data model must include historical entity types to keep track of the changes. Figure 4-29 indicates how historical entity types are incl...

Ngày tải lên: 07/07/2014, 09:20

... in a data model. We reviewed key attributes in sufficient depth. During the data modeling process, at each stage, you need to check the data model for completeness and correctness. Data modeling ... attributes of the business object ORDER. So, the data values you find stored in the database are values of the attributes of the 157 Data Modeling Fundamentals. By Paulraj Ponniah...

Ngày tải lên: 07/07/2014, 09:20

... Data Modeling course. Irrespective of this association, the instance of INSTRUCTOR, namely, Kassia Silverton, will exist in the database. In the same manner, the instance of COURSE, namely, Data ... be faced with in your data modeling projects. Study each issue carefully, understand the exact nature of the issue, and then explore the options to be applied in your data modeling e...

Ngày tải lên: 07/07/2014, 09:20

... method. In a way, this is rela- tional data modeling from scratch. The above figure shows physical data modeling as a final modeling step. Physical data modeling comes very close to implementation. ... relationship. DESIGN ISSUES 219 7 DATA MODELING TO DATABASE DESIGN CHAPTER OBJECTIVES . Make the transition from data modeling to database design . Focus on the relational...

Ngày tải lên: 07/07/2014, 09:20

... implementation data models address data modeling from the point of view of storing and managing data in the database system. However, the objectives of database development are to ensure that any data ... CHAPTER 7 DATA MODELING TO DATABASE DESIGN FIGURE 7-30 Transformation of aggregate entity type. FIGURE 7-31 Transformation of identifying relationship. 266 CHAPTER 7 DATA MO...

Ngày tải lên: 07/07/2014, 09:20