Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Concept explainers

Single Table
In a database management system, a single table is designed to obtain data of heterogeneous items. A single-table design with DynamoDB resolves the issue of raising multiple requests for the relevant data of an entity.
Question

How do I convert this into an sql schema?

The image shows an Entity-Relationship Diagram (ERD) highlighting the relationships and attributes within an academic setting. ### Explanation of the Diagram 1. **Entities:** - **COLLEGE**: Attributes include `CName` and `CPhone`. - **DEAN**: Connected directly to the COLLEGE entity. - **ADMIN**: Linked to the DEAN and DEPT. - **CHAIR**: Manages the DEPT, with a link to the DEAN and STUDENT. - **INSTRUCTOR**: Attributes include `Rank`, `IOffice`, `IName`, and `IPhone`. - **DEPT (Department)**: Attributes include `DName`, `DCode`, `DOffice`, and `DPhone`. - **STUDENT**: Attributes include `MName`, `FName`, `LName`, `SId`, `DOB`, `SName`, `Addr`, `Phone`, and `Major`. - **COURSE**: Attributes include `CCode`, `Credits`, `CoName`, `CDesc`, and `Level`. - **SECTION**: Attributes include `SecId`, `SecNo`, `Year`, `Sem`, `Bldg`, and `RoomNo`. 2. **Relationships:** - **ADMINS**: DEAN administers 0 or more DEPT. - **EMPOYS**: DEPT employs 0 or more INSTRUCTORS. - **HAS**: DEPT has 0 or more STUDENTS. - **OFFERS**: DEPT offers 0 or more COURSEs. - **TAKES**: STUDENTS take 5 or more SECTIONs. - **TEACHES**: INSTRUCTORS teach 1 or more SECTIONs. 3. **Attributes:** - Each entity has specific attributes which define its properties. For example, DEPT has attributes like `DName` (Department Name), `DCode` (Department Code), etc. The diagram effectively maps out the academic structure, including roles, relationships, and hierarchical connections between different entities such as colleges, departments, instructors, students, courses, and sections. This ERD provides a comprehensive view of how different academic elements interact with each other within a college environment.
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Transcribed Image Text:The image shows an Entity-Relationship Diagram (ERD) highlighting the relationships and attributes within an academic setting. ### Explanation of the Diagram 1. **Entities:** - **COLLEGE**: Attributes include `CName` and `CPhone`. - **DEAN**: Connected directly to the COLLEGE entity. - **ADMIN**: Linked to the DEAN and DEPT. - **CHAIR**: Manages the DEPT, with a link to the DEAN and STUDENT. - **INSTRUCTOR**: Attributes include `Rank`, `IOffice`, `IName`, and `IPhone`. - **DEPT (Department)**: Attributes include `DName`, `DCode`, `DOffice`, and `DPhone`. - **STUDENT**: Attributes include `MName`, `FName`, `LName`, `SId`, `DOB`, `SName`, `Addr`, `Phone`, and `Major`. - **COURSE**: Attributes include `CCode`, `Credits`, `CoName`, `CDesc`, and `Level`. - **SECTION**: Attributes include `SecId`, `SecNo`, `Year`, `Sem`, `Bldg`, and `RoomNo`. 2. **Relationships:** - **ADMINS**: DEAN administers 0 or more DEPT. - **EMPOYS**: DEPT employs 0 or more INSTRUCTORS. - **HAS**: DEPT has 0 or more STUDENTS. - **OFFERS**: DEPT offers 0 or more COURSEs. - **TAKES**: STUDENTS take 5 or more SECTIONs. - **TEACHES**: INSTRUCTORS teach 1 or more SECTIONs. 3. **Attributes:** - Each entity has specific attributes which define its properties. For example, DEPT has attributes like `DName` (Department Name), `DCode` (Department Code), etc. The diagram effectively maps out the academic structure, including roles, relationships, and hierarchical connections between different entities such as colleges, departments, instructors, students, courses, and sections. This ERD provides a comprehensive view of how different academic elements interact with each other within a college environment.
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