Relational Model: Data Structure The relational database model consists of three parts: data structure (this section)‚ data integrity‚ and data manipulation. The data structure model defines how to represent data. Most basic to the data structure model is the relation which is illustrated below: A relation‚ which is the most basic part of the data structure model‚ has two parts: relation heading and relation body: * Relation Heading A relation heading is a set of (attribute‚ domain) pairs
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Database Design Scenario Currently a school uses a non-computerised database system to store the following information about its students: roll class‚ surname‚ first name‚ guardian ’s name‚ address‚ student ’s date of birth‚ gender‚ sport house‚ emergency-contact telephone number‚ mailing name‚ list of subjects offered‚ and subjects in which the student is enrolled. The system takes up a large amount of space‚ has many duplicated entries some of these with mistakes and it is time consuming
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Database Design Process Database Life Cycle Key points Database design must reflect the information system of which the database is a part Information systems undergo evaluation and revision within a framework known as the Systems Development Life Cycle (SDLC) Databases also undergo evaluation and revision within a framework known as the Database Life Cycle (DBLC) There are two general design strategies exist: top-down vs. bottom-up design centralized vs. decentralized design 2
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Attempted Question: Question no. 4 • Describe what a relational database is and why relational databases are needed. Introduction: The knowledge of databases is an essential requirement for any being who has majored in the field of computers and IT. Same criteria is involved for a technologist. Relational Database: Relational Database‚ also known as RDB‚ is major sub-branch of Database. A relational database‚ or more commonly known as RDB‚ is a collection of multiple data sets. Mainly
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is an entity? Something about which we want to store data. 7. What is business logic? The set of rules that govern an organizations processes. 8. What is a relational database? A data base that organizes data into overlapping tables. They follow a set of very specific rules that ensure data contained in the database will be consistent. 9. How do the following terms relate to one another: record‚ table‚ field‚ primary key? Rows are called records‚ and columns are sometimes called
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Figure 2. Relational Model provides an overview of the table content‚ table column/attributes and the relationships that connects them. The identified relationships are as follow: a single customer can make multiple sales (1:M)‚ a single sale contains specific set of sales details (1:1)‚ the same payment could be used for multiple sales (1:M). Furthermore‚ an order details can contain multiple books or product items (1:M)‚ a single author can have multiple books in the store (1:M) just as a single
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and relational databases are two different manners in which to store and organize data that also allow management and utilization of that data. There are essential aspects that any database should be able to provide‚ those of creating‚ reading‚ updating and deleting data. Upon becoming familiar with how each database is set up‚ it is important to look at the advantages and disadvantages of each model in determining which type of database one would want to utilize. The hierarchical database is one
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E-Business Model Design‚ Classification‚ and Measurements Magali Dubosson-Torbay Alexander Osterwalder Yves Pigneur Executive Summary “Business model” is one of the latest buzzwords in the Internet and electronic business world. This article has the ambition to give this term a more rigorous content. The objective is threefold. The first objective is to propose a theoretical e-business model framework for doing business in the Internet era. The second is to propose a multidimensional classification-scheme
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studies &research Information technology department Database systems Report on: (Comparison between Relational database & object oriented database) By: Mohammed Hussein Mahmoud Mustafa khedr To: Dr. Saad Darwish Introduction A database is a means of storing information in such a way that information can be retrieved from it. Thus a database is typically a repository for heterogeneous but interrelated pieces of information. Often a database contains more than one table. Codebooks and dictionaries
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Advantages of a Relational database Relational databases are the standard when creating industrial standard efficient and scalable databases. They are based on a structure of tables which are logically connected to each other and can be queried in complex way to extract relevant and meaningful information. The querying of a relational database is done using a high level language called SQL which stands for structured query language. SQL is very easy to understand and unlike
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