The entity-relationship model (or ER model) is a way of graphically representing the logical relationships of entities (or objects) in order to create a database. entity type is a collection of entity instances sharing similar properties Strong Entity Vs Weak Entity An entity set that does not have sufficient attributes to form a primary key is termed as a weak entity set. An entity set that has a primary key is termed as strong entity set. A weak entity is existence dependent. That is the
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Database Management Systems Memo Name: School: DBM-380 Database Concepts Instructor: Date: Database Management Systems Memo CST is a small company doing business for over 30 years. CST provides rehab services with several locations in the Los Angeles Metro area. Due to the nature and size of the business‚ there currently is no need for a huge network infrastructure. CST has a ten user network with two non-networked computers at each of its sites. The financial software is a product
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a family reunion database using Microsoft Access‚ we first need to break down the information currently available to us. Since the database will hold names and other information on family members attending the reunion‚ we need to decide on the model type of the database. Family reunion is rather straightforward event with not much complexity to the data‚ so it will be easier and much more efficient to use Relational Database Model. Relational Database model is a simple database‚ which includes Entities
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1. Advantages of database over Advantages of spread sheets; One of the advantages of database is that it reduced data redundancy this is because in databases‚ there is an identifier. The identifier is the primary key‚ where when it is entered‚ all other details‚ which saved under the primary key‚ will be revealed. Therefore‚ there’ll be less repetition of data. Next‚ databases improved data integrity‚ which it will guaranteed the data proven to be correct. Linked to the primary key function‚ the
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Individual Behavior and Communication Paper XBCOM/230 June 2013 Individual Behavior and Communication Paper The Walt Disney Company was established in 1923‚ by Walt Elias Disney and his brother Roy. The two brothers founded the organization on big dreams and determination. Their primary goal was to make people happy and provide quality entertainment. The Disney organization has been around for over 85 years. The core ideology of the Disney Company promotes a source
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OBJECTIVES OBJECTIVE: The central objective of this project is to provide facility for record system for the university committee. In previous system (i.e. Manual System)‚ the student has to queue up to register his/her name in the alumni register on paper. This was the fully time consuming‚
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ABSTRACT The study focuses on generating a system to be use by Riceland Inn 2. The Riceland Inn 2 Management System software was developed to become a useful equipment to help the Riceland Inn to gather‚ store and manipulate data. It also provides effective protection from unauthorized access. This study centers on a system that built explicitly for the use in Riceland Inn 2 Management. This system may provide different functionality as long as it will be done under the consent of the researchers
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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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DATABASE SPECIFICATIONS 1. TABLE NAME : TBLGENDER FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES GID IntN/A PK‚ IDENTITY NONE GDESC Varchar6 NOT NULL NONE 2. TABLE NAME: TBLGRDLVL FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES GRDID IntN/A PRIMARY KEY‚IDENTITY NONE GRDLVLDESC VarChar15 NOT NULL NONE GRDSECTION Varchar15 NOT NULL NONE 3. TABLE NAME: TBLRANK FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES RANKID IntN/A PRIMARY KEY‚IDENTITY NONE RANKDESC Varchar20 NOT NULL NONE 4.
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SQL INTRODUCTION Diaz‚ Francis Lorenzo A. BSM CS 3B G2 History of SQL SQL began life as SEQUEL11‚ the Structured English Query Language‚ a component of an IBM research project called System/R. System/R was a prototype of the first relational database system; it was created at IBM’s San Jose laboratories by Donald D. Chamberlin and Raymond F. Boyce in 1974‚ and SEQUEL was the first query language to support multiple tables and multiple users. In the late 1970s‚ SQL made its first appearance in
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