08 Jun Database Management 1. Create and Check the E-R Model 1.1
Question
Database Management
1. Create and Check the E-R Model
1.1 Identify Entities
· Customer
· Location
· Vehicle
· Rental Policy
· Promotion
· Employee
1.2 Identify Relationships
| Entity | Relationship | Entity |
| Location | Stocks | Vehicle |
| Location | Has | Employee |
| Customer | Selects | Rental Policy |
| Vehicle | Appears in | Rental Policy |
| Rental Policy | Contains | Promotion |
| Rental Policy | Has | Location |
| Vehicle | Is | Class |
| Employee | Creates | Rental Policy |
1.3 Identify and associate attributes with entities identifying attribute domains and primary keys.
| Entity | Attribute | Description | Data Type | Length | Nulls | Multi-Valued |
| Location | LocationID** | Uniquely Identifies location | Text | 4 fixed characters | No | No |
| Name | Common Name | Text | 60 variable characters | No | No | |
| lstreet | Street of Location | Text | 60 variable characters | No | No | |
| Lcity | City of Location | Text | 20 variable characters | No | No | |
| Lstate | State of Location | Text | 20 variable characters | No | No | |
| Lzip | Zip of Location | Number | 5 variable characters | No | No | |
| Customer | Driver License** | Uniquely Identifies customer | Text | 20 variable characters | No | No |
| First Name | Customer first name | Text | 20 variable characters | No | No | |
| Last Name | Customer last name | Text | 20 variable characters | No | No | |
| Phone Number | Customer phone number | Number | 15 variable characters | No | No | |
| cstreet | Street of customer | Text | 20 variable characters | No | No | |
| ccity | City of Customer | Text | 20 variable characters | No | No | |
| cstate | State of Customer | Text | 20 variable characters | No | No | |
| czip | Zip of Customer | Text | 20 variable characters | No | No | |
| Customer email | Text | 20 variable characters | No | No | ||
| Vehicle | License Plate** | Unique Car Number | Text | 7 fixed characters | No | No |
| Make | Vehicle make | Text | 20 variable characters | No | No | |
| Model | Vehicle model | Text | 20 variable characters | No | No | |
| Year | Vehicle year | Text | 4 variable characters | No | No | |
| Color | Vehicle color | Text | 8 variable characters | No | No | |
| Employee | Driver License** | Unique identifier for employee | Text | 20 variable characters | No | No |
| First Name | Employee first name | Text | 20 variable characters | No | No | |
| Last Name | Employee last name | Text | 20 variable characters | No | No | |
| ePhoneNumber | Employee phone number | Number | 15 variable characters | No | No | |
| estreet | Employee street address | Text | 60 variable characters | No | No | |
| ecity | Employee city | Text | 20 variable characters | No | No | |
| estate | Employee state | Text | 20 variable characters | No | No | |
| ezip | Employee zip | Number | 5 variable characters | No | No | |
| Category | Employee category | Text | 20 variable characters | No | No | |
| Rental Policy | Rental Policy ID** | Uniquely ID Rental Policy | Number | 15 fixed characters | No | No |
| Start Date | Policy Start date | Date | 6 characters | No | No | |
| End Date | Policy end date | Date | 6 characters | No | No | |
| Gas Tank Start | Gas Level Recorded at Start | Text (Multiple Choice) | 3 characters | No | No | |
| Gas Tank End | Gas Level recorded at End | Text (Multiple Choice) | 3 characters | No | No | |
| Extended Price | Price of Rental Policy | Number (Formula) | 6 characters | No | No | |
| Odometer Start | Odometer Reading at Start | Number | 10 character | No | No | |
| Odometer End | Odometer Reading at End | Number | 10 characters | No | No | |
| Promotion | Promotion_ID** | Uniquely Identifies Promotion | Number | 10 fixed character | No | No |
| Start Date | Promotion Start Date | Date | 6 character | No | No | |
| End Date | Promotion End Date | Date | 6 character | No | No | |
| Discount | Promotion Discount | Number (Percentage) | 2 characters | No | No | |
| Class | Class_ID** | Uniquely identifies class_ID | Number | 2 characters | No | No |
| Name | Names the different classes | Text | 10 Characters | No | No | |
| Rate | Rate for the class | Number (Currency) | 4 characters | No | No |
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