Question
Describe how you have represented weak entities, supertype and subtype entities, if any exist. Column Name Data Type (Length) Key Required Default Value Remarks OwnerID
Describe how you have represented weak entities, supertype and subtype entities, if any exist.
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| OwnerID | Integer | PK | Yes | DBMS supplied | Surrogate Key: Initial value=1 Increment=1 |
| OwnerFirstName | Char (30) | No | Yes | None |
|
| OwnerLastName | Char (30) | No | Yes | None | |
| OwnerPhone | Char (12) | No | Yes | None | Format: ###-###-#### |
| OwnerEmailAddress | VarChar (100) | No | No | None |
|
| OwnerStreet | Char (30) | No | Yes | None |
|
| OwnerCity | Char (20) | No | Yes | None |
|
| OwnerState | Char (2) | No | Yes | WA | Format: AA |
| OwnerZip | Char (10) | No | Yes | None | Format: #####-#### |
(a) OWNER
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| PropertyID | Integer | PK | Yes | DBMS supplied | Surrogate Key: Initial value=1 Increment=1 |
| PropertyName | Char (30) | No | Yes | None |
|
| PropertyStreet | Char (30) | No | Yes | None |
|
| PropertyCity | Char (20) | No | Yes | None |
|
| PropertyState | Char (2) | No | Yes | WA | Format: AA |
| PropertyZip | Char (10) | No | Yes | None | Format: #####-#### |
| OwnerID | Integer | FK1 | Yes | None | REF: OWNER |
(b) PROPERTY
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| RepairID | Integer | PK | Yes | DBMS supplied | Surrogate Key: Initial value=1 Increment=1 |
| DescriptionOfRepair | Char (200) | No | Yes | None |
|
| DateOfRepair | Date | No | Yes | None | Format: yyyy-mm-dd |
| CostOfRepair | Numeric (9,2) | No | Yes | None |
|
| EquipmentID | Integer | FK1 | Yes | None | REF: EQUIPMENT |
(c) REPAIR
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| EquipmentID | Integer | PK | Yes | DBMS supplied | Surrogate Key: Initial value=1 Increment=1 |
| DatePurchased | Date | No | Yes | None | Format: yyyy-mm-dd |
| WarrentyEnd | Date | No | No | None | Format: yyyy-mm-dd |
| PurchasePrice | Numeric (9,2) | No | Yes | None | |
| EquipmentUsedFor | Char (100) | No | No | None |
|
| InvoiceNumber | Interger (25) | No | Yes | None |
(d) EQUIPMENT
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| TrainingID | Integer | PK | Yes | DBMS supplied | Surrogate Key: Initial value=1 Increment=1 |
| TrainingName | Char (25) | No | Yes | None |
|
| DescriptionOfTraining | Char (250) | No | No | None | |
| EquipmentID | Integer | FK1 | Yes | None | REF: EQUIPMENT |
(e) TRAINING
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| SubPropertyID | Integer | PK | Yes | DBMS supplied | Surrogate Key: Initial value=1 Increment=1 |
| SubPropertyName | Char (30) | No | Yes | None |
|
| PropertyID | Integer | FK1 | Yes | None | REF: PROPERTY |
(f) SUB_PROPERTY
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| PropertyServiceID | Integer | PK | Yes | DBMS supplied | Surrogate Key: Initial value=1 Increment=1 |
| ServiceDate | Date | No | Yes | None | Format: yyyy-mm-dd |
| ServiceDescription | Char (100) | No | Yes | None |
|
| HoursWorked | Integer | No | Yes | None | |
| CostPerHour | Numeric (9,2) | No | Yes | None |
|
| TotalCost | Numeric (9,2) | No | Yes | None |
|
| EmployeeID | Integer | FK1 | Yes | None | REF: EMPLOYEE |
| SubPropertyID | Integer | FK2 | Yes | None | REF: SUB_PROPERTY |
(g) PROPERTY_SERVICE
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| EmployeeID | Integer | PK | Yes | DBMS supplied | Surrogate Key: Initial value=1 Increment=1 |
| EmployeeLastName | Char (30) | No | Yes | None |
|
| EmployeeFirstName | Char (30) | No | Yes | None | |
| EmployeePhone | Char (12) | No | Yes | None | Format: ###-###-#### |
| EmployeeEmailAddress | Char (100) | No | No | None |
|
| EmployeeAddress | Char (30) | No | Yes | None |
|
| EmployeeCity | Char (20) | No | Yes | None |
|
| EmployeeState | Char (2) | No | Yes | WA |
|
| EmployeeZip | Char (10) | No | Yes | None | Format: #####-#### |
| EmployeeWage | Numeric (9,2) | No | Yes | None |
|
| EmployeeExperience | Char (50) | No | Yes | None |
|
(h) EMPLOYEE
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| PropertyServiceID | Integer | PK, FK1 | Yes | None | REF: PROPERTY_SERVICE |
| EquipmentID | Integer | PK, FK2 | Yes | None | REF: EQUPMENT |
(i) EQUIPMENT_USE
| Column Name | Data Type (Length) | Key | Required | Default Value | Remarks |
| EmployeeID | Number | PK, FK1 | Yes | None | REF: EMPLOYEE |
| TrainingID | Number | PK, FK2 | Yes | None | REF: TRAINING |
(j) EMPLOYEE_TRAINING
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Secrets Of Analytical Leaders Insights From Information Insiders
Authors: Wayne Eckerson
1st Edition
1935504347, 9781935504344
