Create a database schema design based on the following (simplified) requirements of the COMPANY Database: 1. The company is organized into DEPARTMENTs. Each department has a name, number and an employee who manages the department. We keep track of the start date of the department manager. A department may have several locations. 2. Each department controls a number of PROJECTs. Each project has a name, a unique number, and a brief description. 3. We store each EMPLOYEE's social security number, address, salary, gender, and birthdate. a) Each employee works for one department but may work on several projects, which are not necessarily controlled by the same department. b) We keep track of the number of hours per week that an employee currently works on each project. c) We also keep track of the direct supervisor of each employee. 4. Each employee may have a number of DEPENDENTs. a) For each dependent, we keep track of their name, gender, birthdate, and relationship to the employee. We assume each dependent only has one parent works for the company.
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1. The company is organized into DEPARTMENTs. Each department has a name, number and an employee who manages the department. We keep track of the start date of the department manager. A department may have several locations.
2. Each department controls a number of PROJECTs. Each project has a name, a unique number, and a brief description.
3. We store each EMPLOYEE's social security number, address, salary, gender, and birthdate. a) Each employee works for one department but may work on several projects, which are not necessarily controlled by the same department. b) We keep track of the number of hours per week that an employee currently works on each project. c) We also keep track of the direct supervisor of each employee.
4. Each employee may have a number of DEPENDENTs. a) For each dependent, we keep track of their name, gender, birthdate, and relationship to the employee. We assume each dependent only has one parent works for the company.
There are four main entities in the database:
- Employee
- Department
- Project
- Dependents
A supervisor forms a recursive relationship with the Employee entity.
A department has the following attributes:
- Name
- Number
- Locations
A project has the following attributes:
- Name
- Location
- Number
An employee has the following attributes:
- First name
- Last name
- Birth date
- Address
- SSN
- Sex
- Salary
- Minit
A dependent has the following attributes:
- Name
- Birth date
- Relationship
- Sex
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