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1NF, 2NF, 3NF and BCNF in Database Normalization. Database Normalization is a technique of organizing the data in the database.

1NF, 2NF, 3NF and BCNF in Database Normalization

Normalization is a systematic approach of decomposing tables to eliminate data redundancy(repetition) and undesirable characteristics like Insertion, Update and Deletion Anomalies. It is a multi-step process that puts data into tabular form, removing duplicated data from the relation tables. Normalization is used for mainly two purposes,

12 Principles of Agile - XMind. Project Advantages of User Stories as Requirements. Extreme programming (XP) introduced the practice of expressing requirements in the form of user stories, short descriptions of functionality–told from the perspective of a user–that are valuable to either a user of the software or the customer of the software.

Project Advantages of User Stories as Requirements

The following are typical user stories for a job posting and search site: A user can post her resume to the web site. A user can search for jobs. A company can post new job openings. How to Handle a Many-to-Many Relationship in Database Design - DZone Database. What is Use Case Diagram? Here are some questions that have been asked frequently in the UML world are: What is a use case diagram?

What is Use Case Diagram?

Why Use case diagram? Or simply, Why use cases?. Case study systems analysis design and development case study sarahs short cakes sales order system 1532 5822 23 1 104. Systems analysis design and development case study medallion theater–ticket sales system 1532 5822 23 1 109. Learn-software-requirements-analysis-with-case-study. ReqAnalysis. Database Design - Many-to-many. There are some modeling situations that you will find over and over again as you design real databases.

Database Design - Many-to-many

We refer to these as design patterns. If you understand the concepts behind each one, you will in effect be adding new “tools” to your design toolbox that you can use in building the model of an enterprise. Our sales database represents one of these patterns. So far, we have customers and orders. To finish the pattern, we need products to sell. “A product is a specific type of item that we have for sale. . • It is important to understand exactly what this class means: an example product might be named “Blender, Commercial, 1.25 Qt.”, manufactured by Hamilton Beach, model number 908. “Each Order contains one or more Products.” “Each Product is contained in zero or more Orders.” Database Design. System Analysis & Design: Fact Finding Techniques.

To study any system the analyst needs to do collect facts and all relevant information. the facts when expressed in quantitative form are termed as data.

System Analysis & Design: Fact Finding Techniques

The success of any project is depended upon the accuracy of available data. Accurate information can be collected with help of certain methods/ techniques. These specific methods for finding information of the system are termed as fact finding techniques. Interview, Questionnaire, Record View and Observations are the different fact finding techniques used by the analyst. The analyst may use more than one technique for investigation. InterviewThis method is used to collect the information from groups or individuals. The information collected is quite accurate and reliable as the interviewer can clear and cross check the doubts there itself.

QuestionnaireIt is the technique used to extract information from number of people. Library Management System Fera SoR. NFR 18. The 7 Software “-ilities” You Need To Know. In the world of software architecture there are many “-ilities” you must take into consideration with every project.

The 7 Software “-ilities” You Need To Know

Prioritizing them is necessary because the client will optimistically ask that you do all of them. To help you out, here is a quick list outlining my top 7 default “-ilities” in the order that I prioritize them: 1. Usability Software usability can be described as how effectively end users can use, learn, or control the system. A use case is a written description of how users will perform tasks on your website.

It outlines, from a user’s point of view, a system’s behavior as it responds to a request. Each use case is represented as a sequence of simple steps, beginning with a user's goal and ending when that goal is fulfilled. Benefits of Use Cases Use cases add value because they help explain how the system should behave and in the process, they also help brainstorm what could go wrong. They provide a list of goals and this list can be used to establish the cost and complexity of the system. Lucidchart link for Student Account. A Simple Guide to Five Normal Forms in Relational Database Theory. William Kent, "A Simple Guide to Five Normal Forms in Relational Database Theory", Communications of the ACM 26(2), Feb. 1983, 120-125.

A Simple Guide to Five Normal Forms in Relational Database Theory

Also IBM Technical Report TR03.159, Aug. 1981. Also presented at SHARE 62, March 1984, Anaheim, California. Also in A.R. Hurson, L.L. Miller and S.H. Copyright 1996 by the Association for Computing Machinery, Inc. Composite Primary Keys. Ah … primary keys … such a topic!

Composite Primary Keys

When discussing what columns to define as a primary key in your data models, two large points always tend to surface: These can be very complicated and sometimes polarizing things to debate. Use Case Assumptions versus Pre-Conditions (Oracle Unified Method) Within the Oracle Unified Method (OUM) we define the following in relation to Use Cases: Assumptions: Facts we assume to be true, but may later prove to be untrue Pre-Conditions: That which must be true before the Use Case can start Seems pretty clear at this point!

Use Case Assumptions versus Pre-Conditions (Oracle Unified Method)

But in practice, when would it be appropriate to use an Assumption versus a Pre-Condition within a Use Case? Let’s look at a hypothetical Use Case which represents the creation of an On-Line Sales Order (Internet shopping). For the sake of this example, we will name the Use Case – Create On-Line Sales Order If a Business Analyst were writing such a Use Case, one question that might come up is…..”How should we deal with the possibility of the Credit Card Payment Gateway being unavailable during the on-line order creation process?” Agile Software Development - Domesticated Brain. What is an agile development? Agile development is mostly defined as a methodology which is related to software development project management and also describes the way of working as a team to achieve required level of quality in a software product by reducing risk and delivering early benefits.

Unlike traditional software development waterfall model, agile software development is iterative. That means within an agile software development environment we are expecting rapid changes. Why tradition software development techniques sometimes fail and agile development become more popular? Traditional software development methods fail due to changes in the business process and the customer requirements. Apr2014SolModeling. Use Case Diagram Tutorial ( Guide with Examples ) - Creately Blog. Hello! This is the blog. Creately helps you draw beautiful diagrams suprisingly fast! Learn More Hide this.


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