Dear beloved readers, welcome to our website! We hope your visit here brings you valuable insights and meaningful inspiration. Thank you for taking the time to stop by and explore the content we've prepared for you.
------------------------------------------------ **Chen Notation Diagramming Task**
**Objective:** Create a Chen Notation Entity-Relationship Diagram (ERD) based on the following information provided by the Temporary Employment Corporation (TEC). Only Chen Notation Diagrams will be accepted.
---
**Description and Business Rules:**
1. **Candidates:**
- TEC maintains a file of candidates willing to work, which will be stored in a database.
- Each candidate may have a job history if they have worked before.
- Each job assignment results in a new job history record.
- Candidates have earned various qualifications, which can be shared by multiple candidates.
2. **Qualifications:**
- Qualifications are stored in the database. Multiple candidates can earn the same qualification, and one candidate can earn multiple qualifications.
3. **Courses:**
- TEC offers courses to help candidates earn qualifications. Each course develops a specific qualification, but not all qualifications have corresponding courses.
- Some courses have prerequisites, which are qualifications. A course can have multiple prerequisites.
4. **Companies and Job Openings:**
- TEC keeps a list of companies requesting temporary employees.
- Each job opening has an opening number, company name, required qualifications, start and end dates, and hourly pay. This information is stored in a database.
5. **Placements:**
- When a candidate meets the qualifications, they are placed in a job, and a placement record is created, which includes the opening number, candidate number, and total hours worked.
- An opening can be filled by many candidates, and a candidate can fill multiple openings.
---
**Tasks:**
1. **Draw the Chen ERD for the Enterprise:**
- **Entities:** Identify entities such as Candidates, Qualifications, Courses, Companies, Job Openings, and Placements.
- **Attributes:** List all attributes for each entity, like Candidate ID, Qualification Name, Course Title, Company Name, etc.
- **Relationships:** Identify relationships between entities, such as Candidates have Qualifications, Companies have Job Openings, etc.
- **Cardinality:** Determine the cardinality for each relationship (e.g., one-to-many, many-to-many).
- **Resolve Relationships:** Resolve all 1:N and M:N relationships appropriately.
- **Primary and Foreign Keys:** Identify primary keys for each entity and map foreign keys based on cardinality.
---
**Note:** Ensure the diagram represents all the given information accurately, maintaining a clear depiction of how the TEC system operates.
