3/7/13 Crow�s Foot Notation Crow�s Foot Notation A number of data modeling techniques are being used today. One of the most common is the entity relationship diagram (ERD). Several ERD notations are available. For the purposes of CS270 we will be using Crow�s Foot Notation[b1]. Components used in the creation of an ERD: Entity � A person‚ place or thing about which we want to collect and store multiple instances of data. It has a name‚ which is a noun‚ and attributes which describe the
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Problem Solutions 1. Use the following business rules to create a Crow’s Foot ERD. Write all appropriate connectivity’s and cardinalities in the ERD. 1.a. A department employs many employees‚ but each employee is employed by one department. 1.b. Some employees‚ known as “rovers‚” are not assigned to any department. 1.c. A division operates many departments‚ but each department is operated by one division. 1.d. An employee may be assigned many projects‚ and a project may have many employees
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Difference Between ERD and DFD ERD and DFD are data presentation models that help in identifying the flow of data as well as inputs and outputs. They are important as they enable effective communication between members of different departments in an organization. There are similarities in the two types of data presentation models although there are differences that will be talked about in this article. DFD’s are systematic representation of how data flows in an organization‚ how and from where
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ERD Explanation DBM/380 January 23‚ 2012 ERD Explanation There are several levels of normalization such as 1NF‚ 2NF‚ and 3NF. The Huffman Driver database was brought to the normalization level of 3NF by following a series of guidelines from the lowest form of normalization‚ 1NF. The first normalization form level (1NF) consists of the basic rules for an organized database. These are: • Eliminate duplicative columns from the same table. • Create separate tables for each group
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Question 1 Given the following business rules‚ create the appropriate Crow’s Foot ERD. a. A company operates many departments. b. Each department employs one or more employees. c. Each of the employees may or may not have one or more dependents. d. Each employee may or may not have an employment history. Question 2 The Hudson Engineering Group (HEG) has contacted you to create a conceptual model whose application will meet the expected database requirements for the company’s
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Normalization of the ERD By: Vanessa Kennedy Normalization of the ERD The normalization of the ERD along with the driver’s log is taking all of the data within the database and putting the information into tables (World Book‚ 2011). In addition‚ after the data is normalized it then is put into an Entity Relationship Diagram or ERD (World Book‚ 2011). In this paper we will look at the ERD of the driver’s log. The normalization that I would perform on the driver’s log would be on the Driver’s
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research must be given with a recommendation to buy‚ sell‚ or hold‚ with a brief reason why. Recommendations are time sensitive‚ so recommendations must come with a date and time. Currencies are described by code‚ name‚ interest rate‚ and rating (i.e. S&P or Moody’s). Managers may manage multiple portfolios. Every portfolio has its own ID. Portfolios can be regarded as an account and only associated to one client. The portfolio must contain data for available cash‚ and data for trades for each individual
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The term Jim Crow has been in use for more than a century and still has relevance and meaning in the world today. Many people know the term describes the segregation laws that took place in the 1900’s‚ however that much is not the entire story. The term Jim Crow has roots in the deep south‚ and became so popular it was later used as a nickname to describe laws that dehumanized African Americans and striped them of their rights. “Jim Crow” has its roots in the 1830’s when a white minstrel performer
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Cornell Law Library Scholarship@Cornell Law: A Digital Repository Cornell Law Faculty Working Papers Faculty Scholarship 4-10-2010 Digitizing the World ’s Laws Claire M. Germain Cornell Law School‚ cmg13@cornell.edu Recommended Citation Germain‚ Claire M.‚ "Digitizing the World ’s Laws" (2010). Cornell Law Faculty Working Papers. Paper 72. http://scholarship.law.cornell.edu/clsops_papers/72 This Article is brought to you for free and open access by the Faculty Scholarship at
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Huffman Trucking ERD Explanation Alvin Calahan‚ Adam Morgan University of Phoenix Database Concepts DBM/380 Michael James November 19‚ 2011 Huffman Trucking ERD Explanation Huffman Trucking‚ founded in 1936 with a single tractor trailer has grown tremendously over the years. Huffman Trucking now has 800 road trailers‚ 2100 45 ft. trailers‚ 260 roll-on and roll-off units‚ 925 drivers‚ and 425 support personnel. With facilities in Cleveland‚ OH‚ Los Angeles‚ CA‚ St. Louis‚ MO‚ and Bayonne
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