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ovide identification of foreign key of child table and target table.

ovide identification of foreign key of child table and target table.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Provide identification of foreign key of child table and target table. 

 

CSC4402 Homework 3 Database Following is the relational schema for a database about a company and its employees, projects, training courses offered, employee's participation in the projects, and course enrollments (the primary key attributes are underlined): CM (DIVISION DEPT BUDGET) describing departments in the company EM (ID NAME CITY DEPT SALARY) describing employees PR (P-ID DIRECTOR-ID CITY DEPT) describing projects EP (P-ID ID HOUR) describing employee participation in projects CR (C-ID TITLE DEPT TEACHER-ID) describing courses offered ER (C-ID ID GRADE) describing employce enrollments in courses The data type for BUDGET, GRADE, HOUR and SALARY is SMALLINT, all other attributes have data type VARCHAR(20). Each department has one or more employees, offers zero or more courses, and con-ducts zero or more projects. An employee can take zero or more courses and work in zero or more projects(including the projects conducted by other department). Each project has one or more employees working on it, and each course has one or more employees enrolled in it. The teacher of a course could come from a department different from the one offering the course. The attributes ID, TEACHER-ID, and DIRECTOR-ID are employee IDs - so TEACHER-ID and DIRECTOR-ID are foreign keys in CR table and PR table respectively referencing ID attribute in EM table. You should be able to identify foreign keys in several tables in this database. Note that a table could have more than one foreign keys. Here the question for you is to identify the foreign keys in the following table(s) and the target (referenced) table for each foreign key: For table EM, the attribute is a foreign key referencing target table NOW, if a table has MORE THAN one foreign keys, the first foreign key for that table should be about the foreign key attribute appearing earlier in the table's left-to-right column names. For table EP, the attribute is a foreign key referencing target table For table EP, the attribute is a foreign key referencing target table For table ER the attribute is a foreign key referencing target table For table ER the attribute is a foreign key referencing target table
Transcribed Image Text:CSC4402 Homework 3 Database Following is the relational schema for a database about a company and its employees, projects, training courses offered, employee's participation in the projects, and course enrollments (the primary key attributes are underlined): CM (DIVISION DEPT BUDGET) describing departments in the company EM (ID NAME CITY DEPT SALARY) describing employees PR (P-ID DIRECTOR-ID CITY DEPT) describing projects EP (P-ID ID HOUR) describing employee participation in projects CR (C-ID TITLE DEPT TEACHER-ID) describing courses offered ER (C-ID ID GRADE) describing employce enrollments in courses The data type for BUDGET, GRADE, HOUR and SALARY is SMALLINT, all other attributes have data type VARCHAR(20). Each department has one or more employees, offers zero or more courses, and con-ducts zero or more projects. An employee can take zero or more courses and work in zero or more projects(including the projects conducted by other department). Each project has one or more employees working on it, and each course has one or more employees enrolled in it. The teacher of a course could come from a department different from the one offering the course. The attributes ID, TEACHER-ID, and DIRECTOR-ID are employee IDs - so TEACHER-ID and DIRECTOR-ID are foreign keys in CR table and PR table respectively referencing ID attribute in EM table. You should be able to identify foreign keys in several tables in this database. Note that a table could have more than one foreign keys. Here the question for you is to identify the foreign keys in the following table(s) and the target (referenced) table for each foreign key: For table EM, the attribute is a foreign key referencing target table NOW, if a table has MORE THAN one foreign keys, the first foreign key for that table should be about the foreign key attribute appearing earlier in the table's left-to-right column names. For table EP, the attribute is a foreign key referencing target table For table EP, the attribute is a foreign key referencing target table For table ER the attribute is a foreign key referencing target table For table ER the attribute is a foreign key referencing target table
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