Rethinking Rocky Mountain Outfitters Chapter 13 Questions Update the RMO relational database design in Figure 13-9 based on the changes that you made to the ERD. Be sure that all your database tables are in 3NF. Write ODL schema specifications for all new classes and relationships that you added to the class diagram. Verify that the new classes and relationships are accurately represented in the updated relational database design that you developed for question 1. Answers Professor‚ I am confused
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is a "centralized repository of information about data such as meaning‚ relationships to other data‚ origin‚ usage‚ and format." Essentially‚ it is documentation or data about data in a file or database‚ also called metadata. Typical Items In A Data Dictionary For each field or column in a database table‚ describe the following elements: Item Contents File/Table Name The name of the file or table where this field/column is stored (origin) File/Table Description A description of the purpose/usage
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CIS 276 February 5th‚ 2013 1.What is meant by data redundancy? Data redundancy is a situation that occurs within database systems and involves the unintentional creation of duplicated data that is not necessary to the function of the database. 2.What problems are associated with data redundancy? 3.What is an entity? An entity is a person‚ place‚ object‚ event‚ or idea for which you want to store and process data. An attribute‚ field‚ or column is a characteristic or property of an entity.
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DNA databases: crime fighting weapon or threat to privacy 1- A DNA database is a database that contains a profile of bodily fluid left by criminals at the crime scenes. It has developed by the biology laboratory of the Florida department of law enforcement. These profiles are sent to nationwide DNA bank. There are several benefits of these DNA databases. First‚ the DNA can be used as evidence in trials. It allows criminals to be identified by their own genes. Second‚ the computer analysis
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Installing AdventureWorks2012 Database This is a relational database that runs on a Database Engine instance. To install this database‚ do the following: Download the AdventureWork2012 database from http://msftdbprodsamples.codeplex.com/releases/view/55330 The database file name is AdvntureWorks2012_Data.mdf. The file should be in the Downloads folder on your computer. Copy the AdventureWorks2012_Data.mdf file to the data directory of the local SQL Server Database Engine instance. By default
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Shazam Music Identification Service – Case Study CMGT/557 December 23‚ 2013 Table of Contents Table of Figures Shazam Music Identification Service Music is playing an active role in people’s life; individuals are regularly exposed to music in various venues: driving‚ dining‚ or even swimming. According to Music Reports (2013)‚ 90% of music content is stored in a digital medium. 60% is offered online through music services such as‚ iTunes‚ Spotify‚ and Shazam. The music
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botes@nwu.ac.za DATABASES I 1 Chapter 4 The Relational Database Model Textbook p116-121 Study Unit: 4 2 In this chapter‚ you will learn: • What is meant by relational algebra? • How to manipulate database tables using relational set operators • How the DBMS supports the key relational operators: select‚ project and join. • The different types of joins. • How to write queries using relational algebra expressions. 3 Relational Algebra • Relational algebra and relational calculus are
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Select Statement The SQL SELECT statement is used to select data from a SQL database table. This is usually the very first SQL command every SQL newbie learns and this is because the SELECT SQL statement is one of the most used SQL commands. SELECT "column_name" FROM "table_name" Distinct The SQL DISTINCT clause is used together with the SQL SELECT keyword‚ to return a dataset with unique entries for certain database table column. SELECT DISTINCT "column_name" FROM "table_name" Where The SQL
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retrieving data quickly‚ much like a relational database except it isn’t based on the mathematical relationship between tables as a traditional relational database does. NoSQL datastores can be much faster than relational databases but generally lack the robustness that those provide for the speed. The growth of ultra large websites like Facebook and Google has lead to the development of NoSQl as a way of breaking through the speed constraints that relational databases provide. Most work on storing and
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types of physical aggression (Anderson‚ 2016‚ pp. 59).” Aggression can be depicted in different forms. One example is verbal aggression‚ when an individual says something that is hurtful to another individual with the intent to hurt their feelings. Relational aggression is a form of aggression that involves the individual trying doing things without the other individual knowing with the intent to damage their reputation or intrapersonal relationships. An example of this is spreading rumors to intentionally
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