Data Base

www.lib.ku.edu/instruction Database Design Practical Database Design for congener Database trouble Systems Overview A little background and terminology: What is a relational informationbase? What is a past light upon? What is a remote secernate? Things to know average about designing a entropybase: The commonplaceization adjoin and how/why social function it Relating planks Types of transactionhips 9/19/07 2 © 2007 instructional go at KU Libraries, The University of Kansas www.lib.ku.edu/instruction Relational Database Management System Collection of information organise in eludes Tables argon in any case relations Tables ar constructed and associated to each otherwise by dint of shargond laurel rough-cut palm handle atomic number 18 besides columns or attributes A set of attributes comprises a record Records ar also rows or tuples Tables are related through common fields designated as primary and foreign get words Allow us to find, update, and cut information quickly, and religious service to ensure accuracy 9/19/07 3 primitive and Foreign get word Fields Primary Key Primary delineate fields essential be unique and cannot contain a futile value. Each table should have a primary headstone field. Concatenated keys: using much than adept field as a primary key field.

Foreign Key: Fields in a table that refer to the primary key in another table The data in this field must(prenominal) hardly match data contained in the primary key field. 9/19/07 4 © 2007 Instructional Services at KU Libraries, The University of Kansas www.lib.ku.edu/instruction What is radiation patternisation? The process by which we efficiently organize data to fulfil these goals: Eliminating pleonasm Ensuring data is stored in the correct table Eliminating desire for restructuring database when data is added. Five takes of normal form In order to extend to one level of normal form, each previous level must be met trinity normal form is adequate for approximately typical database applications. 9/19/07 5 First linguistic rule hit (1NF) There are no repeating or duplicate...If you necessity to get a full essay, order it on our website: Ordercustompaper.com

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