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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
Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter8: Advanced Sql
Section: Chapter Questions
Problem 18RQ
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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?
Transcribed Image Text: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?
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