What Is Super Key In Dbms? Superkey - A superkey is defined in the relational model as a set ofattributes of a relation variable (relvar) for which it holds that inall relations assigned to that variable there are no two distincttuples (rows) that have the same values for the attributes... in Software What Is Super Key In Dbms Give Example? A superkey is a combination of attributes that can be uniquely used to identify a database record.With primary key if any other attribute is added then that
Premium Data modeling Relational model SQL
Mental models are ways in which an individual processes information in there minds. Psychologist Kenneth Craig suggested that individuals build small complex models to anticipate events in reality. It is a representation of reality‚ intuitively perceived by an individual. AAA Transportations and its employees‚ Vernon and Bud‚ are having a conflict between each others individual mental models. Vernon‚ the driver supervisor‚ and Bud‚ a corporate worker‚ have been working for AAA Transportations for
Premium Goal Model Bud
Chapter one 1.0 Introduction Database system developed because of the need to store large amount of data and retrieve that data quickly and accurately for example‚ a University abrary stores details about the books held and loans taken out by student. Not very long ago this information about the books and loads might have been stored in a box card index‚ nowadays‚ only a few decades later‚ student are able to view their loans online and see if a book is available and reserve it. The abrary staff
Premium Database normalization Relational model
modeling was originated 30 years ago and up to date is being used in mostly every field of work. It has become a mainstream practice in managing human resources. Over the years‚ the methods used has evolved. The trends used in the approach of competency models in education‚ training‚ assessments and development of workers has changed mainly because of its response to the changes that also occurs in the organizations and different workplace. It may also change because of the needs of the people. During those
Premium Human resource management Human resources Management
Higher Diploma in Computer Science-2013/2014 Batch HDCS-AS06-ACA Student Number: Theory Session: Assignment submission date: 04th August 2014 Last date of acceptance (with penalty and marks reduction): 11th August 2014 Assignment Topic Consider the following scenario. Dinuki Hire firm is a small family business that stocks general equipment such as garden tools‚ car maintenance tools etc. for hiring to its customers. A database system is required to simplify management of the business
Premium Database management system Database SQL
Owns to Accounts. The E/R diagram below showes underlined keys and the numerocity constraint. [pic] 3. The E/R diagram below represents ships. Ships are said to be sisters if they were designed from the same plans. Convert this diagram to a relational database schema. Solution: Ships(name‚ yearLaunched) SisterOf(name‚ sisterName) [pic] 4. Consider a relation representing the present position of molecules in a closed container. The attributes are an ID for the molecule‚ the
Premium Relational model Florida Keys Relation
Management Information Systems MANAGING THE DIGITAL FIRM‚ 12TH EDITION GLOBAL EDITION Chapter 6 FOUNDATIONS OF BUSINESS INTELLIGENCE: DATABASES AND INFORMATION MANAGEMENT Management Information Systems CHAPTER 6: FOUNDATIONS OF BUSINESS INTELLIGENCE: DATABASES AND INFORMATION MANAGEMENT Learning Objectives • Describe how the problems of managing data resources in a traditional file environment are solved by a database management system • Describe the capabilities and value of a database
Premium SQL Data management Database
information) 4. Backup and recover 5. Exporting and importing data 6. Keeping integrity of data ------------------------------------------------------------------------------------------------------------ Types of database systems: 1. Relational database - Data and structure are independent in program - Use tables (rows and columns) - Use query - Powerful management system - Use the following types of relationships between tables: A. One-to-one relationship (1:1) - A particular
Premium Database Relational model SQL
Comparison Summary By Martin Rennhackkamp DBMS Server Comparison Supplement‚ November 1996 An Analysis Of The Strengths And Weaknesses Of The Big Six Database Servers. In 1991 I performed a thorough evaluation and comparison of the four major DBMSs at the time: Informix‚ Ingres‚ Oracle‚ and Sybase. This comparison was done for a client building a huge distributed database application‚ currently in its second phase of d evelopment‚ with the first phase running successfully country-wide. At
Premium SQL Relational model Database management system
indirect costs and determine the actual cost of specific technology implementations‚ you would use a: Total cost of ownership model. 4. Microsoft Word is an example of: Word-processing software. 5. All of the following place strain on system capacity‚ except for: Streamlining transaction processes and associated data entry. 6. The join operation: combines relational tables to provide the user with more information than is otherwise available. 7. The specialized language programmers use to
Premium SQL Microsoft Relational model