and modify the relations in BEC figure 10-2 to include your changes. 2. Study your answer to question 1. Verify that the relations you say represent the My roadway database are in third normal form. if they are not. Change them so that they are. 3. The E-R diagram you developed in questions in the BEC case at the end of chapter 9 should have shown minimum cardinalities on both ends of each relationship. are minimum cardinalities represented in some way in the relations is your answer
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Data Anomalies Normalization is the process of splitting relations into well-structured relations that allow users to inset‚ delete‚ and update tuples without introducing database inconsistencies. Without normalization many problems can occur when trying to load an integrated conceptual model into the DBMS. These problems arise from relations that are generated directly from user views are called anomalies. There are three types of anomalies: update‚ deletion and insertion anomalies. An update anomaly
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Consider a relation representing the present position of molecules in a closed container. The attributes are an ID for the molecule‚ the x‚ y‚ and z coordinates of the molecule‚ and its velocity in the x‚ y‚ and z dimensions. What FD’s would you expect to hold? What are the keys? Solution: Surely ID is a key by itself. However‚ we think that the attributes x‚ y‚ and z together form another key. The reason is that at no time can two molecules occupy the same point. Consider a relation with schema
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managing information system development projects at AAA Systems. To better track progress in completing projects，you have decided to maintain a simple database table to track the time your employees spend on various tasks and projects with which they are associated. It will also allow you to keep track of employees’ billable hours each week. The table below provides a sample data set. Project_Name Task Name Employee_ID Production Week Hours Worked Fin-Goods- Inv App. Devel. 456 21
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Subject of Course Project In today competitive economy‚ we need information system in every aspect of the organization because Information systems help in decision making process in a cost effective way. Using technologies to discover‚ analyze and act in real time on the large volumes of data in research laboratories will be beneficial to the organizations. Every organization produces large amount of data and we need a system to contain it and extract information effectively. Databases management
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questions and modify the relations in BEC figure 10-2. To include your changes? 2. Study your answer to Question 1. Verify that the relations you say represent the MyBroadway database are in third normal form. If they are not‚ change them so that they are? 3. The E-R diagram you developed in questions in the BEC case at the end of Chapter 9 should have shown minimum cardinalities on both ends of each relationship. Are minimum cardinalities represented in some way in the relations in your answer question
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this‚ there is not any type of established database currently running inside of SCAM. While Excel databases have been used by employees on and off‚ there is nothing that is permanently kept on a public drive. The need to track all the artwork throughout the museum is a direct result of a piece of valuable art that was misplaced. Currently‚ the museum has 20 employees‚ each with their own work PC. There is a small server that is kept in house that stores the company ’s information and is accessible
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Management Info Systems QANL 3343 Management: Carrying out managerial functions to achieve a common goal Functions of Management: 1) Leading 2) Organizing 3) Planning 4) Controlling Information: Facts: Data: Facts about objects and events (color‚ weight‚ size‚ length‚ ect) measured by our senses or instruments. Information: Processed data: Methods of data processing: 1) Simple operations such as counting‚ sorting‚ categorizing‚ ect 2) Math/ Stat operations such as averages‚ sums‚ Std
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results are required to satisfy easy for the use of non-experts Prof P Sreenivasa Kumar‚ Department of CS&E‚ IITM. 1 TRC – a declarative query language Tuple variable – associated with a relation ( called the range relation ) • takes tuples from the range relation as its values • t: tuple variable over relation r with scheme R(A‚B‚C ) t.A stands for value of column A etc TRC Query – basic form: { t1.Ai1‚ t2.Ai2‚…tm.Aim | θ } predicate calculus expression involving tuple variables t1‚ t2‚…‚ tm‚ tm+1
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1. Describe the relations that would be produced by the following relational algebra operations a) ПhotelNo(σprice>100(Room)) It will produce a single attribute (hotelNo) giving the number of hotels room prices greater 100. b) σHotel.hotelNo=Room.hotelNo(Hotel X Room) A join produce of hotel and room containing all the attributes of both. c) ПhotelName(Hotel Hotel.hotelNo=Room.hotelNo (σprice>100(Room))) It is a join of hotel and room with the price greater than 100. d) Guest(σdateTo>’1-June-12’(Booking)
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