Entity-Relationship (E/R) Model Dr P Sreenivasa Kumar Professor CS&E Dept I I T Madras Entity-Relationship (E/R) Model Widely used conceptual level data model • proposed by Peter P Chen in 1970s Data model to describe the database system at the requirements collection stage • high level description. • easy to understand for the enterprise managers. • rigorous enough to be used for system building. Concepts available in the model • entities and attributes of entities. • relationships between
Premium Entity-relationship model
1. MySQL is the world’s second most widely used open-source relational database management system (RDBMS). It is named after co-founder Michael HYPERLINK "http://en.wikipedia.org/wiki/Michael_Widenius"Widenius’s daughter‚ My. The SQL phrase stands for Structured Query Language. The default port of Mysql is 3306. The MySQL development project has made its source code available under the terms of the GNU General Public License‚ as well as under a variety of proprietary agreements. MySQL was owned
Premium SQL Database management system Database management systems
D.A.R.E. Program Paragraph In the D.A.R.E. program we learned many facts and a lot of information about keeping ourselves safe and healthy. We learned how to say “NO” to drugs‚ because it’s not just what you say; but instead‚ how you say it. When you say no to drugs you are saving yourself from many things like getting colds and upper respiratory problems‚ and cancer of mouth‚ throat‚ bladder‚ and kidney. We learned that nicotine is a powerful substance that causes addiction and if you take drugs
Premium Drug addiction Medicine Pharmacology
Relational Sales - Focusing on Your Customers’ Needs Facilitating the Customer’s Decision to Buy In an increasingly competitive business climate‚ customers are faced with a multitude of alternative products and vendors. A traditional approach based on "closing the sale" may be inefficient and even counter-productive. In today’s markets‚ customers need customized solutions to their needs. Rather than being sold to‚ customers want to buy. In relational sales the emphasis is on building and maintaining
Premium Sales
DATABASE A database is an organized collection of data. The data is typically organized to model aspects of reality in a way that supports processes requiring information. (1) Often abbreviated DB‚ a database is basically a collection of information organized in such a way that a computer program can quickly select desired pieces of data. You can think of a database as an electronic filing system. Traditional databases are organized by fields‚ records‚ and files. A field is a single piece of information;
Premium SQL Database Relational model
DataBase Concepts DataBase – a collection of information related to specific entity (e.g. organization‚ bank‚ college‚ library etc.) DBMS – (Database management system) – a application through which we can control the database i.e. we can store data into database‚ update the data and delete also we can retrieve the data from database. For doing these operation DBMS support a language called Structured Query language (SQL). SQL accomplishes many powerful tasks with a mere seven statements: SELECT
Premium SQL Database
Database Concepts‚ 4e (Kroenke) Chapter 1 Getting Started 1) The purpose of a database is to help people keep track of things. Answer: TRUE Diff: 1 Page Ref: 4 2) A possible problem with keeping data in lists is that if you delete a row of data from a list you may also delete some data items that you want to keep. Answer: TRUE Diff: 1 Page Ref: 4 3) An advantage of keeping data in lists is that if you update a data value in one row of data in a list‚ other occurrences
Premium SQL Database Relational database
images‚ voices and movies. The huge amount of data in different multimedia applications deserved to have the databases since the databases could provide consistency‚ integrity‚ security and availability of the data. From the user perspective‚ databases offer functionality for easy manipulation‚ query‚ and retrieval of relevant information from huge collections of stored data. Multimedia databases have to cope up with the increasing usage of large volume of multimedia data used in various software applications
Premium Database
Unit 18 Task 1 - What are the benefits of a relational database? A benefit of a relational database would be that the data is only stored once. This means you don’t have to change multiple records and it doesn’t take up much storage space. For the veterinary practise this is ideal for them‚ as this is the main reason to why they’re changing from paper to Microsoft Access. Having everything on Access and not on paper means they can search for information quicker through the search bar and also it
Premium SQL Data modeling Database
Contents Introduction 2 Wrycza et al. ’s Research (2007) 3 Rao et al. ’s research (2003) 5 Prananto et al. ’s research (2004) 7 Alonso Mendo and Fitzgerald ’s research (2005) 9 The usefulness of using E-Commerce Maturity Model (ECMM) 11 Conclusion 14 Reference 14 Introduction In today ’s economy‚ organisations try to gain strategic and operational advantages over other competitors in their industry because of the rapid advance of technology and globalisation. Companies
Premium Management Strategic management Business process modeling