from data model to relational database design

... Outline  Relational Model Concepts  Relational Model Constraints and Relational Database Schemas  Update Operations and Dealing with Constraint Violations Relational Model Concepts  The relational ... the relational approach in this chapter Relational Model Concepts  The model was first proposed by Dr E.F Codd of IBM in 1970 in the following paper: "A Relational Model for Large Shared Data ... arbitrarily to be the primary key The primary key attributes are underlined Key Constraints Entity Integrity  Relational Database Schema: A set S of relation schemas that belong to the same database...

Ngày tải lên: 12/05/2014, 11:55

... 2008 Relational Database Design and Implementation Louis Davidson With Kevin Kline, Scott Klein, and Kurt Windisch 8662FM.qxp 7/28/08 6:19 PM Page ii Pro SQL Server 2008 Relational Database Design ... CHAPTER Introduction to Database Concepts s CHAPTER The Language of Data Modeling 33 s CHAPTER Conceptual Data Modeling ... xxiii s CHAPTER Introduction to Database Concepts Database Design Phases Conceptual...

Ngày tải lên: 29/10/2013, 15:15

... when it comes to the concepts and basic theories that are fundamental to proper database design Database Design Phases Too often when I sit down to build a system that requires data storage, the ... poor database design or add features missing from the database No role is more critical to any datacentric application than the role of the data modeler User interfaces come and go, but data ... writing Purpose of Database Design What is the purpose of database design? Why the heck should you care? The main reason is that a properly designed database is straightforward to work with, because...

Ngày tải lên: 29/10/2013, 15:15

... Metadata Metadata is data stored to describe other data Knowing how to find information about the data stored in your system is very important Codd’s fourth rule states the following: The database ... your system, certainly as they pertain to the process of creating a database and the data to be stored in the database Often, no specific tool is used to document these rules, other than Microsoft ... hold, back up, and subsequently restore data when necessary It does not limit you to accessing data within only that one database; however, managing data in separate databases becomes a more manual...

Ngày tải lên: 08/11/2013, 21:15

... her name, so in the actors database they add a uniquifier to the name to make it unique A uniquifier might be some meaningless value added to a column or set of columns to give you a unique key ... If you happen to hire two people called Sir Lester James Fredingston III, then the second of them probably isn’t going to take kindly to being called Les for short just so your database system ... that is definitely going to allow you to uniquely identify every row in your database One thing of interest here is that what might be considered a natural key in your database is often not actually...

Ngày tải lên: 08/11/2013, 21:15

... relational database product before to learn why relational databases are designed in the way they are, and get some practical examples and advice for creating databases Topics covered cater to ... of database design? The first five chapters of this book are devoted to the fundamental tasks of relational database design and preparing your mind for the task at hand: designing databases The topics ... the need to design a relational database using any of the Microsoft SQL Server family of databases It is intended to be useful for the beginner to advanced programmer, either strictly database...

Ngày tải lên: 12/02/2014, 12:20

... information model is a conceptual design for a database It describes the concepts to be stored in the database Implementation of a database from an information model The vast majority of relational database ... a CASE tool, one designs the database, then connects to a data source, and then has the CASE tool issue the data definition queries to build the database Documentation of the database design ... printed from the CASE tool Subsequent changes to the database design can be made in the CASE tool and then applied to the database itself The workhorse for most database applications is data retrieval...

Ngày tải lên: 23/03/2014, 16:20

... The ER conceptual schema diagram for the COMPANY database FIGURE 7.2 Result of mapping the COMPANY ER schema into a relational schema ER -to- Relational Mapping Algorithm (cont)  Step 2: Mapping ... customary to specify a new key attribute, called a surrogate key, when creating a relation to correspond to the category – In the example below we can create a relation OWNER to correspond to ... 4.7 to relations Mapping Exercise Figure 7.7 shows an ER schema for a database that may be used to keep track of transport ships and their locations for maritime authorities Map this schema into...

Ngày tải lên: 12/05/2014, 11:55

... right-hand-side attributes are in Ri 1 Informal Design Guidelines for Relational Databases (1)  What is relational database design? The grouping of attributes to form "good" relation schemas  Two levels ... are hard to understand or to detect  The database designers need not normalize to the highest possible normal form (usually up to 3NF, BCNF or 4NF)  Denormalization: the process of storing the ... level – The storage "base relation" level  Design is concerned mainly with base relations  What are the criteria for "good" base relations? Informal Design Guidelines for Relational Databases...

Ngày tải lên: 12/05/2014, 11:55

... for Relational Database Schema Design (7) Discussion of Normalization Algorithms: Problems:    The database designer must first specify all the relevant functional dependencies among the database ... join property with respect to F 2 Algorithms for Relational Database Schema Design (1) Algorithm 11.2: Relational Synthesis into 3NF with Dependency Preservation (Relational Synthesis Algorithm) ... schema to ensure the attribute preservation property Claim 3: Every relation schema created by Algorithm 11.2 is in 3NF Algorithms for Relational Database Schema Design (2) Algorithm 11.3: Relational...

Ngày tải lên: 12/05/2014, 11:55

... stored in the data dictionary 1A.17 Relational Database Design DATABASE DESIGNING AND PLANNING Introduction to Relational Database Management System Database Designing and Planning • • ©NIIT Database ... database planning and design and the stages in the database development life cycle Relational Database Design 1A.2 INTRODUCTION TO DATABASE MANAGEMENT SYSTEM Introduction to Relational Database Management ... are: • Database manager • File manager • Disk manager Introduction to Relational Database Management System Relational Database Design Lesson / Slide 11 of 12 1A.26 Introduction to Relational Database...

Ngày tải lên: 01/08/2014, 09:22

... Although the term database typically refers to a collection of related data tables, an Access database includes more than just data In addition to tables, you can add: •Saved queries (stored procedures) ... Summary Data storage principles Attempt to store data time / place; Do not store data that may be calculated from other fields (utilize queries); and Strive for very discrete data storage (no ambiguity ... reports together to build a data software application Design to the lowest common denominator (Murphy will use your program early and often) Always look for and design carrots to win over the true data...

Ngày tải lên: 24/10/2014, 15:10

... for Relational Database Schema Design (7) Discussion of Normalization Algorithms: Problems:    The database designer must first specify all the relevant functional dependencies among the database ... schema to ensure the attribute preservation property Claim 3: Every relation schema created by Algorithm 11.2 is in 3NF Algorithms for Relational Database Schema Design (2) Algorithm 11.3: Relational ... { CD, BE, ABC} Algorithms for Relational Database Schema Design (2) Consider the relation scheme R= {ABCDEG} subject to FDs F= { A→B, BC → D, D → EG } Convert R into a 3NF scheme STEP R={ABCDEG}...

Ngày tải lên: 04/12/2015, 00:22

... logical data models into global model To merge local logical data model into a single global logical data model This activities in this step include: – Step 2.6.1 Merge local logical data models into ... Step 2.6 Merge logical data models into global Model (optional step) To merge logical data models into a single global logical data model that represents all user views of a database © Pearson Education ... 1995, 2005 Step Build and Validate Logical Data Model To translate the conceptual data model into a logical data model and then to validate this model to check that it is structurally correct using...

Ngày tải lên: 21/10/2014, 23:21

... diagrams shown below are taken from the example answers for Question and of the Chapter 11 Entity-Relationship Modeling Tutorial However, for the purposes of this tutorial, the attributes associated ... reorderLevel inStock PartOf 1 Customer Order ordeNo (PK} status dateDue /totalPrice Places * 1 custNo {PK} name fName lName address street city postcode telNo creditLimit Present a relational schema ... RelatedTo * Dependent dName {PPK} dAddress relationship (b) Product OrderDetails Requires qty status /totalPrice 1 * * prodNo {PK} desc price cost numberAllocation reorderQty reorderLevel inStock...

Ngày tải lên: 22/10/2014, 10:46

... Data Modeling and Database Design 8Ć7 8Ć8 Introduction to Oracle: SQL and PL/SQL Using Procedure Builder Database Design Designing a relational database system involves converting a model into ... relationship model D Translate an entity relationship model into a relational database design Overview of Data Modeling and Database Design 8Ć3 Class Management Note: This lesson is an overview to the ... that it refers to a PK or UK Overview of Data Modeling and Database Design 8Ć27 8Ć28 Introduction to Oracle: SQL and PL/SQL Using Procedure Builder Designing the Database The database design stage...

Ngày tải lên: 10/12/2013, 17:15

... application had to emulate the decision making of an application engineer when responding to queries from design engineers who wished to select a product with particular attributes for use in the design ... developers to create a model of the original case; however, like all models it is an abstraction from the complex reality of the domain of interest Contrary to initial claims, it was clear to the ... with social actors’ competencies in attempting to comprehensively communicate or represent their knowledge In addition, actors might just be too busy to document what they know due to the complexity...

Ngày tải lên: 20/12/2013, 19:15

... 12 Activity 3.2: Relating Data Requirements to Conceptual Design Exercise 1: Analyzing Your Own Experience of Conceptual Design ! Compare your experience with the concepts ... that has to service many users simultaneously Reflect on the process that you used to create a conceptual design for the project Then answer the following questions: a How is conceptual design ... development project, pick any other type of project that involved some activities related to conceptual data design For example, creating a little-league sports roster, a scoring or organization...

Ngày tải lên: 21/12/2013, 06:16

... a relational database and its components D Read an entity relationship model D Translate an entity relationship model into a relational database design Overview of Data Modeling and Database Design ... activities that you perform to achieve the best possible database design Database Design Database design is just one of the stages of the development cycle Through good database design, you can achieve ... of Data Modeling and Database Design 8Ć9 Server ÉÉ ÉÉ ÉÉ ÉÉ 8Ć10 Introduction to Oracle: SQL and PL/SQL Using Procedure Builder Data Model Models are a cornerstone of design Engineers build a model...

Ngày tải lên: 21/12/2013, 06:17