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: PEARSON
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Question

Business rules for this ERD graph?

### Business Rules Based on Crow’s Foot ERD Given the following Crow’s Foot Entity-Relationship Diagram (ERD), the subsequent business rules can be derived: #### Entity Descriptions 1. **CUSTOMER** - **Attributes**: - `CUS_NUM` (Primary Key) - `CUS_LNAME` 2. **RENTAL** - **Attributes**: - `RENT_NUM` (Primary Key) - `CUS_NUM` (Foreign Key) - `RENT_CHARGE` - `RENT_PAID` - `RENT_LATE_CHG` 3. **RENT_LINE** - **Attributes**: - `LINE_NUM` (Primary Key, Foreign Key1) - `RENT_NUM` (Primary Key, Foreign Key2) - `TAPE_CODE` - `LINE_COPY` - `LINE_CHG_DAY` - `LINE_CHARGE` - `LINE_DATE_OUT` - `LINE_DATE_IN` 4. **TAPE** - **Attributes**: - `TAPE_CODE` (Primary Key) - `TAPE_COPY` - `TAPE_NAME` - `TAPE_CHARGE` #### Relationships and Graphical Explanation 1. **CUSTOMER generates RENTAL**: - A `CUSTOMER` can generate one or more `RENTALS`. - This is depicted by the line connecting `CUSTOMER` to `RENTAL` with a crow’s foot notation indicating a one-to-many relationship. 2. **RENTAL contains RENT_LINE**: - A `RENTAL` can contain one or more `RENT_LINES`. - This relationship is shown through the link between `RENTAL` and `RENT_LINE`, also with a crow’s foot notation pointing to `RENT_LINE`. 3. **RENT_LINE enters TAPE**: - Each `RENT_LINE` contains details about `TAPES`, indicating a one-to-one or one-to-many relationship where `RENT_LINE` entries are associated with `TAPE` records. - This relationship is represented by the line connecting `RENT_LINE` to `TAPE`. #### Additional Notes The primary keys (PK) and foreign keys (FK) are explicitly marked in the schema: - `CUS_NUM` in `RENTAL` is a foreign
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Transcribed Image Text:### Business Rules Based on Crow’s Foot ERD Given the following Crow’s Foot Entity-Relationship Diagram (ERD), the subsequent business rules can be derived: #### Entity Descriptions 1. **CUSTOMER** - **Attributes**: - `CUS_NUM` (Primary Key) - `CUS_LNAME` 2. **RENTAL** - **Attributes**: - `RENT_NUM` (Primary Key) - `CUS_NUM` (Foreign Key) - `RENT_CHARGE` - `RENT_PAID` - `RENT_LATE_CHG` 3. **RENT_LINE** - **Attributes**: - `LINE_NUM` (Primary Key, Foreign Key1) - `RENT_NUM` (Primary Key, Foreign Key2) - `TAPE_CODE` - `LINE_COPY` - `LINE_CHG_DAY` - `LINE_CHARGE` - `LINE_DATE_OUT` - `LINE_DATE_IN` 4. **TAPE** - **Attributes**: - `TAPE_CODE` (Primary Key) - `TAPE_COPY` - `TAPE_NAME` - `TAPE_CHARGE` #### Relationships and Graphical Explanation 1. **CUSTOMER generates RENTAL**: - A `CUSTOMER` can generate one or more `RENTALS`. - This is depicted by the line connecting `CUSTOMER` to `RENTAL` with a crow’s foot notation indicating a one-to-many relationship. 2. **RENTAL contains RENT_LINE**: - A `RENTAL` can contain one or more `RENT_LINES`. - This relationship is shown through the link between `RENTAL` and `RENT_LINE`, also with a crow’s foot notation pointing to `RENT_LINE`. 3. **RENT_LINE enters TAPE**: - Each `RENT_LINE` contains details about `TAPES`, indicating a one-to-one or one-to-many relationship where `RENT_LINE` entries are associated with `TAPE` records. - This relationship is represented by the line connecting `RENT_LINE` to `TAPE`. #### Additional Notes The primary keys (PK) and foreign keys (FK) are explicitly marked in the schema: - `CUS_NUM` in `RENTAL` is a foreign
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