Lesson 1 What is a database: A database is a group of data that has been organised in a table or group. This makes it easy to find data‚ but also allows you to not have any duplicates in a group. A database is used in a school or college to store students date of births. This allows the school to be able to see how old the students are. The database can also be password protected to keep the data safe. What is a flat file database: A flat database is where you have all your data in one table.
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History of Relational Database Hao-Wei He Wilmington University October 9‚ 2010 Abstract Database system have been inseparable with our daily life‚ since IBM developed the hierarchical database management system in 1969‚ database system has been innovated many times‚ such as hierarchical database‚ network database‚ relational database‚ and object-oriented database. Nowadays‚ relational database still is the most popular model used by different industries; this article is going to introduce
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Fundamentals of Relational Database Design By Paul Litwin This paper was part of a presentation at a Microsoft TechEd conference in the mid-1990s. It was adapted from Microsoft Access 2 Developer’s Handbook‚ Sybex 1994‚ by Ken Getz‚ Paul Litwin and Greg Reddick. Reprinted with permission of the publisher. While the paper uses Microsoft Access (version 2) for the examples‚ the vast majority of the discussion applies to any database and holds up pretty well over 11 years after it was written. Overview
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Files and Relational Databases What is a file? • contains groups of records used to provide information for operations‚ planning‚ management and decision making. • can be used for storing data for an indefinite period of time‚ or they can be used to store data temporarily for a specific purpose. FILE TYPES • Master Files -- contain records for a group of entities. The attributes may be updated often‚ but the records themselves are relatively permanent. These files
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I. Column Oriented Database A column-oriented DBMS is a database management system (DBMS) that stores data tables as sections of columns of data rather than as rows of data. In comparison‚ most relational DBMSs store data in rows. This column-oriented DBMS has advantages for data warehouses‚ customer relationship management (CRM) systems‚ and library card catalogs‚ and other ad hoc inquiry systems where aggregates are computed over large numbers of similar data items. It is possible to achieve
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February 2013 WATERMARKING RELATIONAL DATABASES Mayuree K.Rathva¹‚Prof.G.J.Sahani² Dept.of Computer Engineering‚ SVIT‚Vasad‚ Anand‚Gujarat‚ INDIA ¹mayurirathva@gmail.com and ²Gurcharan_sahani@yahoo.com ABSTRACT Uptil now most of the work is done on image‚ video‚ audio.but today the Database watermarking becomes the research topic because of the increasing the use of relational database systems. Which deals with the legal issue of copyright protection of database systems. .Watermarking is an
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Exploring Microsoft Access 2010 by Robert Grauer‚ Keith Mast‚ Mary Anne Poatsy Chapter 2 Relational Databases and Queries Copyright © 2013 Pearson Education‚ Inc. Publishing as Prentice Hall. 1 Objectives • • • • • • • Design data Create tables Understand table relationships Share data with Excel Establish table relationships Create a single-table query Specify criteria for different data types Copyright © 2013 Pearson Education‚ Inc. Publishing as Prentice Hall.
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Accounting Information System Summary of Relational Database 1. Relational databases underlie most modern integrated AISs. a. They are the most popular type of database used for transaction processing. b. In this chapter‚ we’ll define the concept of a database. 2. Database systems were developed to address the problems associated with the proliferation of master files. a. For years‚ each time a new information need arose‚ companies created new files and programs. b. The result: a significant
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The history began between Relational Databases and SQL. In 1970‚ Edgar F. Codd wrote the now-famous paper on relational data modeling: "A Relational Model of Data for Large Shared Data Banks." The original relational database language‚ developed by IBM‚ was called SEQUEL (Structured English Query Language) to support its prototype RDBMS (Relational Database Management System) called System/R. The name later was changed from SEQUEL to Structured Query Language. In the beginning Codd started out a
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A relationship is an important component of a relational database. A relationship exists between two tables when one or more key fields from one table are matched to one or more key fields in another table. The fields in both tables usually have the same name‚ data type‚ and size. It also helps to further refine table structures and minimize redundant data. The purpose of a query is to retrieve information from a table or tables‚ which can be based on some type of criteria. To put it simply‚ a query
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