Exercises 9 address driver-id person name owns license model year car report-number location date driver participated accident damage-amount Figure 2.1 E-R diagram for a Car-insurance company. Exercises 2.1 Explain the distinctions among the terms primary key‚ candidate key‚ and superkey. Answer: A superkey is a set of one or more attributes that‚ taken collectively‚ allows us to identify uniquely an entity in the entity set. A superkey may contain extraneous attributes
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3.9.2 Data Flow Diagram (DFD) DFD or Data Flow Diagram is a graphical representation that showing the flow of data of information system. It also shows the structured design of the program to replace the flowchart or pseudo code as program tool. Basically DFD can be divided into four components such as entity or external entity‚ process‚ data store and data flow. DFD start with an overview of the system that needs to be designed. This DFD known as context DFD that contain the entity and the process
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assumptions in a Credit Card Sale System are: 1. The Customer and the Retailer have an account in the same bank. 2. Instead of the grid through which all the banks are connected the payment is processed by the bank for simplicity. E-R Diagram Tables and Primary Keys Normalization Forms The three normalization forms are 1. First normal form 2. Second normal form 3. Third normal form First normal form First normal form states that there should be no repeating elements
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Dexit is a rechargeable‚ contactless‚ stored-value smart key tag used for electronic payment in on-line or off-line systems in Toronto‚ Canada‚ since 2003. Instead of coins or cards (and PIN)‚ Dexit uses an RFID key tag device associated with funds transferred from ordinary bank accounts. There is no link to access the accounts from the key tag‚ a feature to guard against the abuse of lost key tags. Accounts can be filled up from the Dexit website‚ by telephone‚ at participating merchants‚ or
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Marriage Essay Hoobant October 28‚ 2012 Many people plan on getting married at some point in their life. That being said‚ there are risks involved with getting married. Marriages are prone to failure because of lack of passion‚ lack of commitment and lack of intimacy. Marriage is a gamble‚ it has its ups and downs and there is no guarantee for a successful marriage. Many couples feel madly in love with each other and then decide to get married. Over the course of many years together‚ most couples
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Häfner‚ M.‚ & Trampe‚ D. (2009). When thinking is beneficial and when it is not: The effects of thin and round advertising models. Journal of Consumer Psychology‚ 19(4)‚ 619628. doi: 10.1016/j.jcps.2009.06.004 The main research question is how different size models shown in advertisements have an effect on product evaluations? In the first experiment‚ the hypothesis is“[e]xplicit product evaluations are more positive when a round model advertises the product than when a thin model does. Implicit product evaluations follow an
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Analysis of the Dick Spencer’s Case With reference to the case‚ micromanagement practice‚ employees’ resistance to organizational change‚ ineffective management by wandering around approach‚ and Dick’s managerial problem solving are the main managerial issues that can be identified in the case. Micromanagement Practice Micromanagement refers to the control of an enterprise in every particular and to the smallest detail‚ with the effect of obstructing progress and neglecting broader‚ higher-level
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Draw ENTITY RELATIONSHIP DIAGRAM (ERD) for the following requirement: 1. Students take courses in a college 2. Customers have accounts in a bank 3. People own vehicles 4. Employees manage projects 5. Machines are made up of parts 6. A college offers several courses. Attributes of the course include course code‚ name and credits. Each course may have zero or more subjects 7. Hotel (HotelNo‚ Name‚ Add‚ TelNo) Room (RoomNo‚ HotelNo‚ Type‚ Price) Booking (HotelNo
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PART 1 MODULE 3 VENN DIAGRAMS AND SURVEY PROBLEMS EXAMPLE 1.3.1 A survey of 64 informed voters revealed the following information: 45 believe that Elvis is still alive 49 believe that they have been abducted by space aliens 42 believe both of these things 1. How many believe neither of these things? 2. How many believe Elvis is still alive but don’t believe that they have been abducted by space aliens? SOLUTION TO EXAMPLE 1.3.1 When we first read the data in this example‚ it may seem as if the numbers
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Marks and Spenser is the largest retailer in UK‚ and 43rd in the world. The company owns more than 1103 stores‚ of which 703 - in the UK‚ and the remaining 400 in 44 other countries (Marks & Spencer‚ 2013). M&S has been known as a manufacturer of clothing‚ but since the 2000s‚ the company developed in other areas‚ including: food‚ household good‚ financial services. In 1998‚ M&S became the first British retailer profit of which exceeded £ 1 billion (Bevan‚ 2002). This essay will focus
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