4. Relational model. (6A „Asrl-sCi Consider the following relational database schema that contains information about eîmployees and projects to which they are assigned. Emp (eid, lastname, gender, DOB) Assign (eid. pid, hours) Proi (pid, pname, budget, manager eid) Answer the following questions. (a) Find two superkeys in the Proi table – both of these two superkeys should NOT be same as the primary key. You should use appropriate set notation if the superkev contains multiple attributes. (b) Suppose the Emp and Proi tables have been created appropriately. Define (i.e., create) the Assign table in SQL (Just create only one table.) You should follow all the requirements discussed in the class. (c) Suppose in the Proi table a project has changed pid from P06 to P07. From the perspective of integrity constraints, how should this modification be handled?

4. Relational model. (6A „Asrl-sCi Consider the following relational database schema that contains information about eîmployees and projects to which they are assigned. Emp (eid, lastname, gender, DOB) Assign (eid. pid, hours) Proi (pid, pname, budget, manager eid) Answer the following questions. (a) Find two superkeys in the Proi table – both of these two superkeys should NOT be same as the primary key. You should use appropriate set notation if the superkev contains multiple attributes. (b) Suppose the Emp and Proi tables have been created appropriately. Define (i.e., create) the Assign table in SQL (Just create only one table.) You should follow all the requirements discussed in the class. (c) Suppose in the Proi table a project has changed pid from P06 to P07. From the perspective of integrity constraints, how should this modification be handled?

Database Systems: Design, Implementation, & Management

11th Edition

ISBN:9781285196145

Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel

Chapter10: Transaction Management And Concurrency Control

Section: Chapter Questions

Problem 1P

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"2.1,2.2,2.3, and 2.4 are answered" Introduction The given problem is related to the normalization process of a database table where the requirement is to identify the normal forms of the given sample table and decompose the table. The normalization is a process to break the table into smaller tables to that: a) There is no redundancy b) Table is free from insertion, update and delete anomaly. c) Data in the tables can be handled easily **As per Bartleby guidelines, as the required number of sub-parts to be answered is not mentioned and it is needed to solve first 3 sub-parts. Kindly find the solution to half assignment(first 4 sub-parts). 2.1 Normal form of given table The given table is in unnormalized form i.e. it is not even in the first normal form of the database normalization. Explanation: a) For a single Invoice number, there are many products added to the table. b) There is no direct primary key that can be used to store the data uniquely. c) The given table…
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Explain the CAP theorem and its implications for distributed database systems. Provide examples of systems that prioritize each of the three CAP properties.
4. (a) Why is normalization important in database design? Consider the universal relation R = {A, B, C, D, E, F, G, H, I, J} and the set of functional dependencies F = { AB → C, A → DE, B → F, F → GH, D → IJ }.What is the key for R? Decompose R into 2NF (Second Normal Form) and then 3NF (Third Normal Form) relations. (b) Consider a relation schema R = (X, Y, Z) on which the following functional dependencies hold: { XY → Z, Z → X }. Show that the schema R is not in BCNF (Boyce-Codd Normal Form) but it is in 3NF (Third Normal Form).
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1b)By using a scenario, explain program-data dependence issue found in previous database technologies such as file-oriented database before relational database model was introduced.

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