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The following query is intended to list IDs and names of all students taking HIS 118. However, this query does not work properly. Briefly explain why and show the corrected SQL query. SELECT stuD, firstName, lastName FROM Students, Enrolls WHERE classNumber = 'HIS 118';

The following query is intended to list IDs and names of all students taking HIS 118. However, this query does not work properly. Briefly explain why and show the corrected SQL query. SELECT stuD, firstName, lastName FROM Students, Enrolls WHERE classNumber = 'HIS 118';

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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The following query is intended to list IDs and names of all students taking HIS 118. However, this query does not work properly. Briefly explain why and show the corrected SQL query. SELECT stuD, firstName, lastName FROM Students, Enrolls WHERE classNumber = 'HIS 118';
### Relational Database Overview Let us consider the following relational database: - **Students**(`stuID`, lastName, firstName, major, credits) - **Faculty**(`facID`, name, deptName, rank) - **Classes**(`classNumber`, facID, schedule, room) - **Enrolls**(`stuID`, `classNumber`, grade) The primary keys are underlined. The referential integrity constraints are as follows: - The column `facID` of relation **Classes** references table **Faculty**. - The column `stuID` of relation **Enrolls** references table **Students**. - The column `classNumber` of relation **Enrolls** references table **Classes**. ### Explanation of Diagrams and Constraints #### Diagram/Diagram Explanation There are no diagrams accompanying this text. However, to visualize these relationships, consider the following: 1. **Tables and Relationships**: - **Students Table**: Contains essential student information such as student ID, last name, first name, major, and the number of completed credits. - **Faculty Table**: Lists faculty members with details like faculty ID, name, department name, and academic rank. - **Classes Table**: Includes class details with a unique class number, linked faculty ID, schedule, and room allocation. - **Enrolls Table**: Maps student enrollments to classes with columns for student ID, class number, and the grade received. 2. **Primary Keys**: - `stuID` in **Students**. - `facID` in **Faculty**. - `classNumber` in **Classes**. - Composite key (`stuID`, `classNumber`) in **Enrolls**. 3. **Referential Integrity Constraints**: - **Classes.facID** references **Faculty.facID**, ensuring each class is associated with an existing faculty member. - **Enrolls.stuID** references **Students.stuID**, ensuring all recorded enrollments are for existing students. - **Enrolls.classNumber** references **Classes.classNumber**, ensuring enrollments are tied to existing classes.
Transcribed Image Text:### Relational Database Overview Let us consider the following relational database: - **Students**(`stuID`, lastName, firstName, major, credits) - **Faculty**(`facID`, name, deptName, rank) - **Classes**(`classNumber`, facID, schedule, room) - **Enrolls**(`stuID`, `classNumber`, grade) The primary keys are underlined. The referential integrity constraints are as follows: - The column `facID` of relation **Classes** references table **Faculty**. - The column `stuID` of relation **Enrolls** references table **Students**. - The column `classNumber` of relation **Enrolls** references table **Classes**. ### Explanation of Diagrams and Constraints #### Diagram/Diagram Explanation There are no diagrams accompanying this text. However, to visualize these relationships, consider the following: 1. **Tables and Relationships**: - **Students Table**: Contains essential student information such as student ID, last name, first name, major, and the number of completed credits. - **Faculty Table**: Lists faculty members with details like faculty ID, name, department name, and academic rank. - **Classes Table**: Includes class details with a unique class number, linked faculty ID, schedule, and room allocation. - **Enrolls Table**: Maps student enrollments to classes with columns for student ID, class number, and the grade received. 2. **Primary Keys**: - `stuID` in **Students**. - `facID` in **Faculty**. - `classNumber` in **Classes**. - Composite key (`stuID`, `classNumber`) in **Enrolls**. 3. **Referential Integrity Constraints**: - **Classes.facID** references **Faculty.facID**, ensuring each class is associated with an existing faculty member. - **Enrolls.stuID** references **Students.stuID**, ensuring all recorded enrollments are for existing students. - **Enrolls.classNumber** references **Classes.classNumber**, ensuring enrollments are tied to existing classes.
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