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Compute the average number of hours for the courses offered by each college.

Compute the average number of hours for the courses offered by each college.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Find the relation algebra query based on the SQL given. 

16. Compute the average number of hours for the courses offered by each college.
Transcribed Image Text:16. Compute the average number of hours for the courses offered by each college.
The text comprises relational data structured into tables for an educational institution, Madeira College. Below are detailed transcriptions and descriptions of each table: ### DEPARTMENT Relation: - **NAME**: Lists departments like Economics, GA/QM, Mathematics, IS, Philosophy. - **DCODE**: Unique departmental codes (e.g., 3 for Arts and Sciences). - **COLLEGE**: Indicates the college (e.g., Arts and Sciences, Business). - **PHONE**: Department contact numbers. - **LOCATION**: Physical locations of departments (e.g., 123 McMicken). - **HEAD**: Head of department identification codes (e.g., FM9276). ### COURSE Relation: - **NAME**: Course titles such as "Intro to Economics" and "Principles of IS." - **COURSE#**: Numeric codes for each course. - **CREDIT**: Credit hours for each course. - **COLLEGE**: Indicates the associating college. - **HRS**: Weekly hours allocated to each course. - **DCODE**: Department code linkage. ### STUDENT Relation: - **SID**: Student identification numbers. - **NAME**: Student names. - **ADDRESS**: Residential addresses. - **BIRTHDATE**: Birthdates in a DD-MMM-YY format. - **GRADE/LEVEL**: Current grade or educational level. ### PROFESSOR Relation: - **NAME**: Names of faculty members. - **EMPID**: Employee identification numbers. - **PHONE**: Contact numbers. - **DATEHIRED**: Hiring dates. - **DCODE**: Department codes for faculty. - **SALARY**: Salary details. ### TEXTBOOK Relation: - **ISBN**: ISBN numbers for books. - **TITLE**: Titles like "Database Management", "Linear Programming." - **YEAR**: Publication years. - **PUBLISHER**: Publishers of each title. ### TAKES Relation: - **SECTION**: Section numbers. - **GRADE**: Grades achieved. - **SID**: Student IDs linked to grades. ### USES Relation: - **COURSE#**: Course numbers. - **ISBN**: ISBNs of textbooks used in courses. - **EMPID**: Faculty linked to course resources. ### SECTION Relation: - **SECTION**: Section numbers. - **MAX#**: Maximum enrolment capacity. - **ROOM**: Location room numbers.
Transcribed Image Text:The text comprises relational data structured into tables for an educational institution, Madeira College. Below are detailed transcriptions and descriptions of each table: ### DEPARTMENT Relation: - **NAME**: Lists departments like Economics, GA/QM, Mathematics, IS, Philosophy. - **DCODE**: Unique departmental codes (e.g., 3 for Arts and Sciences). - **COLLEGE**: Indicates the college (e.g., Arts and Sciences, Business). - **PHONE**: Department contact numbers. - **LOCATION**: Physical locations of departments (e.g., 123 McMicken). - **HEAD**: Head of department identification codes (e.g., FM9276). ### COURSE Relation: - **NAME**: Course titles such as "Intro to Economics" and "Principles of IS." - **COURSE#**: Numeric codes for each course. - **CREDIT**: Credit hours for each course. - **COLLEGE**: Indicates the associating college. - **HRS**: Weekly hours allocated to each course. - **DCODE**: Department code linkage. ### STUDENT Relation: - **SID**: Student identification numbers. - **NAME**: Student names. - **ADDRESS**: Residential addresses. - **BIRTHDATE**: Birthdates in a DD-MMM-YY format. - **GRADE/LEVEL**: Current grade or educational level. ### PROFESSOR Relation: - **NAME**: Names of faculty members. - **EMPID**: Employee identification numbers. - **PHONE**: Contact numbers. - **DATEHIRED**: Hiring dates. - **DCODE**: Department codes for faculty. - **SALARY**: Salary details. ### TEXTBOOK Relation: - **ISBN**: ISBN numbers for books. - **TITLE**: Titles like "Database Management", "Linear Programming." - **YEAR**: Publication years. - **PUBLISHER**: Publishers of each title. ### TAKES Relation: - **SECTION**: Section numbers. - **GRADE**: Grades achieved. - **SID**: Student IDs linked to grades. ### USES Relation: - **COURSE#**: Course numbers. - **ISBN**: ISBNs of textbooks used in courses. - **EMPID**: Faculty linked to course resources. ### SECTION Relation: - **SECTION**: Section numbers. - **MAX#**: Maximum enrolment capacity. - **ROOM**: Location room numbers.
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