chapter 2 exploring the entity data model
Data Modeling Using the Entity - Relationship Model
... identified by the combination of: – A partial key of the weak entity type – The particular entity they are related to in the identifying entity type Example: Suppose that a DEPENDENT entity is identified ... Degree, Field)} Entity Types and Key Attributes Entities with the same basic attributes are grouped or typed into an entity type For example, the EMPLOYEE entity type or the PROJECT entity type ... relational model Resolution Ltd Xcase Conceptual modeling up to code maintenance Sybase Enterprise Application Suite Data modeling, business logic modeling Visio Visio Enterprise Data modeling,...
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2 Understanding the Oracle Data Guard Architecture
... standby databases • The operating system and platform architecture for the primary and standby databases must be the same • The operating system releases for the primary and standby databases ... this lesson, you should be able to the following: • Describe the Data Guard architecture • Explain the operational requirements of Data Guard • Describe how Data Guard processes, transports, and ... different • If all databases are on the same system, verify that the OS allows you to mount more than one database with the same name 2-3 Copyright © 2006, Oracle All rights reserved Data Guard Operational...
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Tài liệu Activity 4.2: Creating a Logical Data Model ppt
... Join the group to which you have been assigned by the instructor Review the entities identified in Activity 4.1 Draw a box for each entity in the space below, and label the box with the entity s ... entities, and label the line with the relationship verb This is the initial ER diagram for the logical data model Answer in v04_1609a_act42-1.bmp Activity 4.2: Creating a Logical Data Model Exercise ... relationship on your ER diagram, ask the question “How many of the parent entity work with how many of the child entity? ” This question will help you determine whether the cardinality of each relationship...
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Tài liệu Web Client Programming with Perl-Chapter 2: Demystifying the Browser-P1 pdf
... example, the browser is given the following URL: http://hypothetical.ora.com/ The browser interprets the URL as follows: http:// In the first part of the URL, you told the browser to use HTTP, the ... about the document and about the server itself Then after a blank line, it returns the document The series of lines before the first blank line is called the response header, and the part after the ... tells the client how many bytes are in the entity body that follows the headers In this case, the entity body is 327 bytes long The sixth line specifies the most recent modification time of the...
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Tài liệu Web Client Programming with Perl-Chapter 2: Demystifying the Browser-P2 doc
... a server response In the server response, the general header and entity headers are the same as those used in the client request The entity- body is like the one used in the client request, except ... The status code indicates the result of the request, and the reason phrase is a human-readable description of the status-code The response header tells the client about the configuration of the ... format The complete rundown of these transformations is covered in Appendix B At this point, the server processes the request by forwarding this information on to the CGI program The CGI program then...
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The POSTGRES Data Model
... presents the data model Section describes the attribute type system Section describes how the query language can be extended with user-defined procedures Section compares the model with other data models ... is to move the computation that constructs the mainmemory data structure to the database process Suppose the procedure MakeForm built the data structure given the name of a form Using the parameterized ... referenced elsewhere in the query If the reference is in the target-list, the return tuple will not contain the attribute.2 If the reference is in the qualification, the clause containing the qualification...
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The Relational Data Model and Relational Database Constraints
... by the theory of relations We review the essentials of 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 ... Data is based on the concept of a Relation A Relation is a mathematical concept based on the ideas of sets The strength of the relational approach to data management comes from the formal foundation ... Relational Model Concepts Relational Model Constraints and Relational Database Schemas Update Operations and Dealing with Constraint Violations Relational Model Concepts The relational Model of Data...
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Lecture 07: Mô hình quan hệ thực thể (Entity Relationship Modelling) pot
... from chapter of Atzeni et al, “Database Systems” McGraw Hill, 1999 Phân tích yêu cầu phần mềm Ví dụ thể cho liên kết Exam Adapted from chapter of Atzeni et al, “Database Systems” McGraw Hill, ... from chapter of Atzeni et al, “Database Systems” McGraw Hill, 1999 11 Phân tích yêu cầu phần mềm Bản số (Cardinalities) Adapted from chapter of Atzeni et al, “Database Systems” McGraw Hill, 1999 ... “Database Systems” McGraw Hill, 1999 18 Phân tích yêu cầu phần mềm Hiểu rõ việc chọn khóa 19 Phân tích yêu cầu phần mềm Khái quát hóa (Generalizations) Adapted from chapter of Atzeni et al, “Database...
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Chapter 4 - Exploring the External Environment: Macro and Industry Dynamics potx
... OBJECTIVES Explain the importance of the external context for strategy and firm performance Use PESTEL to identify the macro characteristics of the external context Identify the major features ... services are bundled, the cost to switch to another service provider will be greater Internet Provider Companies THE BALANCE OF POWER Rubbermaid Wal-Mart THE EXTERNAL ENVIRONMENT OF THE ORGANIZATION ... changed the airline business model by adopting new processes (e.g., a point-to-point model) 21 SCENARIO PLANNING An understanding of the big picture and a plan to manage uncertainty Assess the strategic...
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chapter 2 types of e-business models and markets
... other buyer organization credentials The Member Subsystem of Commerce Integrator authenticates the buyer agent against the buyer organization data stored in the WCBE database If successful, the ... eMP connects the buyer to the remote eMP site The buyer browses the catalog on the remote eMP and creates an RFQ template The RFQ template is then sent as an XML message to the eMP The RFQ template ... XML message The remote eMP notifies the target sellers The sellers view the RFQ and create responses for it The responses are then sent to the local eMP as XML messages The buyer views the RFQ responses...
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Tài liệu C++ Lab 2 Sending the output to a printfile Data Types: Chapter 2 ppt
... What are the known information about this programming assignemnt? There are ten dollars in a quarter roll There are five dollars in a dime roll There are two dollars in a nickel roll And there are ... penny_rolls = remainder * After doing all the above, go to the computer lab, launch the Visual C++ or whatever compiler you like Many of you write the entire program in then spend hours trying to debug ... indicates the beginning of the main int dollar, quarterR, dimeR, nickelR, pennyR, remainder; Variables that are used in the main are declared There are six variables of type integer These variable...
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ASSESSING the ACCURACY of REMOTELY SENSED DATA - CHAPTER 2 pptx
... reference data The rows usually are used to display the map labels or classified data generated from the remotely sensed data Thus, two labels from each sample are compared to one another: • Reference ... Reference data labels: the class label of the accuracy assessment site derived from data collected that is assumed to be correct; and • Classified data or map labels: the class label of the accuracy ... well you are doing Despite the maturing of the technology over the last 15 years, some remote sensing analysts are still stuck in this mentality The second epoch is called the age of non-site specific...
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The Water Encyclopedia: Hydrologic Data and Internet Resources - Chapter 2 potx
... pay the correct fee for the data to be digitally entered I suggest offering an electronic copy of the records by email to both the department and data entry person By making them part of the ... derailed the entire project in India An agency insisted that a task was within their realm of authority but showed neither the will nor the capacity to perform the work as required Rather the agency ... systems, the country can be divided into four zones: † the northern basin (24% of the territory) with the Amu Darya and its tributaries (14%), which drain toward the Aral sea, and the rivers of northern...
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Modeling phosphorus in the environment - Chapter 2 ppsx
... fate and transport models depend on the purpose of the model, as well as on the spatial and temporal scales of the model The purpose of such models is usually either to determine the relative impact ... more of the soil water is at the surface than deeper in the profile, the potential for runoff is greater Some of the phosphorus models keep track of soil moisture by layer, so they have the potential ... If the infiltration capacity of the soil is exceeded by the rainfall intensity (L/T), then water will pond on the soil surface, and the infiltration rate will equal the infiltration capacity If the...
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Data Mining - Chapter 2
... lý liệu Pattern Evaluation/ Presentation Data Mining Patterns Task-relevant Data Data Warehouse Data Cleaning Selection/Transformation Data Integration Data Sources 2.1 Tổng quan giai đoạn tiền ... đo phân tán liệu Quartiles The second quartile (Q2): the 50th percentile (median) The first quartile (Q1): the 25th percentile The third quartile (Q3): the 75th percentile Interquartile ... liệu Biến đổi liệu (data transformation): chuẩn hoá liệu (data normalization) Thu giảm liệu (data reduction): thu giảm kích thước liệu (nghĩa giảm số phần tử) kết hợp liệu (data aggregation),...
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chapter-2-models
... Models B2B model The Growth of B2B E-commerce SOURCES: U.S Census Bureau, 2008; authors’ estimates ELECTRONIC COMMERCE Chapter 2: Models B2B model -Sell side ELECTRONIC COMMERCE Chapter 2: Models ... Theo đối tượng tham gia: B2B, B2C, C2C Theo mức độ số hóa Theo mô hình doanh thu Theo phương thức kết nối January 2010 ELECTRONIC COMMERCE Chapter 2: Models Theo đối tượng tham gia Chính phủ G Chính ... COMMERCE Chapter 2: Models Quy trình mua hàng Truyền thống January 2010 ELECTRONIC COMMERCE Chapter 2: Models January 2010 ELECTRONIC COMMERCE Chapter 2: Models I Phân loại mô hình Theo đối tượng...
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Data Models, Datasets, and the ADO.NET Interface
... need the help of the TableAdapter here, because we’ll write our own ADO.NET interface code to connect to the database and get the data All we want from the wizard is the dataset with the data ... to the data source and make a call to ExecuteReader() to open the data reader stream for the DataReader object Finally, a DataReader object is used to get the data that is streaming from the data ... return a data reader stream into the DataReader (drReport) object The next line is a special call to the Load() method from the dataset This call will read the data from DataReader to the table...
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Bài giảng Chapter 7 The Quantum-Mechanical Model of the Atom
... • the amplitude is the height of the wave the distance from node to crest or node to trough the amplitude is a measure of how intense the light is – the larger the amplitude, the brighter the ... is proportional to the amplitude and frequency of the waves the larger the wave amplitude, the more force it has the more frequently the waves strike, the more total force there is Tro, Chemistry: ... brighter the light • the wavelength, (λ) is a measure of the distance covered by the wave the distance from one crest to the next or the distance from one trough to the next, or the distance between...
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