During peak periods, Temporary Employment Corporation (TEC) places temporary workers in companies. TEC’s manager gives you the following description of the business: TEC has a file of candidates who are willing to work. If the candidate has worked before, that candidate has a specific job history. (Naturally, no job history exists if the candidate has never worked.) Each time the candidate works, one additional job history record is created. Each candidate has earned several qualifications. Each qualification may be earned by more than one candidate. (For example, it is possible for more than one candidate to have earned a BBA degree or a Microsoft Network Certification. And clearly, a candidate may have earned both a BBA and a Microsoft Network Certification.) TEC offers courses to help candidates improve their qualifications. Every course develops one specific qualification; however, TEC does not offer a course for every qualification. Some qualifications have multiple courses that develop that qualification. Some courses cover advanced topics that require specific qualifications as prerequisites. Some courses cover basic topics that do not require any prerequisite qualifications. A course can have several prerequisites. A qualification can be a prerequisite for more than one course. Courses are taught during training sessions. A training session is the presentation of a single course. Over time, TEC will offer many training sessions for each course; however, new courses may not have any training sessions scheduled right away. Candidates can pay a fee to attend a training session. A training session can accommodate several candidates, although new training sessions will not have any candidates registered at first. TEC also has a list of companies that request temporaries. Each time a company requests a temporary employee, TEC makes an entry in the Openings folder. That folder contains an opening number, a company name, required qualifications, a starting date, and anticipated ending date, and hourly pay. Each opening requires only one specific or main qualification. When a candidate matches the qualification, the job is assigned, and an entry is made in the Placement Record folder. That folder contains an opening number, a candidate number, the total hours worked, etc. In addition, an entry is made in the job history for the candidate. An opening can be filled by many candidates, and a candidate can fill many openings. TEC uses special codes to describe a candidate’s qualifications for an opening. TEC’s management wants to keep track of the following entities: COMPANY OPENING QUALIFICATION CANDIDATE JOB_HISTORY PLACEMENT COURSE SESSION Given that information, do the following: Draw the Chen ERDs for this enterprise. Identify all possible relationships. Identify the connectivity for each relationship. Identify the dependencies for the relationships. Resolve all M: N relationships.

During peak periods, Temporary Employment Corporation (TEC) places temporary workers in companies. TEC’s manager gives you the following description of the business: TEC has a file of candidates who are willing to work. If the candidate has worked before, that candidate has a specific job history. (Naturally, no job history exists if the candidate has never worked.) Each time the candidate works, one additional job history record is created. Each candidate has earned several qualifications. Each qualification may be earned by more than one candidate. (For example, it is possible for more than one candidate to have earned a BBA degree or a Microsoft Network Certification. And clearly, a candidate may have earned both a BBA and a Microsoft Network Certification.) TEC offers courses to help candidates improve their qualifications. Every course develops one specific qualification; however, TEC does not offer a course for every qualification. Some qualifications have multiple courses that develop that qualification. Some courses cover advanced topics that require specific qualifications as prerequisites. Some courses cover basic topics that do not require any prerequisite qualifications. A course can have several prerequisites. A qualification can be a prerequisite for more than one course. Courses are taught during training sessions. A training session is the presentation of a single course. Over time, TEC will offer many training sessions for each course; however, new courses may not have any training sessions scheduled right away. Candidates can pay a fee to attend a training session. A training session can accommodate several candidates, although new training sessions will not have any candidates registered at first. TEC also has a list of companies that request temporaries. Each time a company requests a temporary employee, TEC makes an entry in the Openings folder. That folder contains an opening number, a company name, required qualifications, a starting date, and anticipated ending date, and hourly pay. Each opening requires only one specific or main qualification. When a candidate matches the qualification, the job is assigned, and an entry is made in the Placement Record folder. That folder contains an opening number, a candidate number, the total hours worked, etc. In addition, an entry is made in the job history for the candidate. An opening can be filled by many candidates, and a candidate can fill many openings. TEC uses special codes to describe a candidate’s qualifications for an opening. TEC’s management wants to keep track of the following entities: COMPANY OPENING QUALIFICATION CANDIDATE JOB_HISTORY PLACEMENT COURSE SESSION Given that information, do the following: Draw the Chen ERDs for this enterprise. Identify all possible relationships. Identify the connectivity for each relationship. Identify the dependencies for the relationships. Resolve all M: N relationships.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Can you tell me if there is any mistakes in this diagram??

thats its requirenments:

During peak periods, Temporary Employment Corporation (TEC) places temporary workers in companies. TEC’s manager gives you the following description of the business:

TEC has a file of candidates who are willing to work.
If the candidate has worked before, that candidate has a specific job history. (Naturally, no job history exists if the candidate has never worked.) Each time the candidate works, one additional job history record is created.
Each candidate has earned several qualifications. Each qualification may be earned by more than one candidate. (For example, it is possible for more than one candidate to have earned a BBA degree or a Microsoft Network Certification. And clearly, a candidate may have earned both a BBA and a Microsoft Network Certification.)
TEC offers courses to help candidates improve their qualifications.
Every course develops one specific qualification; however, TEC does not offer a course for every qualification. Some qualifications have multiple courses that develop that qualification.
Some courses cover advanced topics that require specific qualifications as prerequisites. Some courses cover basic topics that do not require any prerequisite qualifications. A course can have several prerequisites. A qualification can be a prerequisite for more than one course.
Courses are taught during training sessions. A training session is the presentation of a single course. Over time, TEC will offer many training sessions for each course; however, new courses may not have any training sessions scheduled right away.
Candidates can pay a fee to attend a training session. A training session can accommodate several candidates, although new training sessions will not have any candidates registered at first.
TEC also has a list of companies that request temporaries.
Each time a company requests a temporary employee, TEC makes an entry in the Openings folder. That folder contains an opening number, a company name, required qualifications, a starting date, and anticipated ending date, and hourly pay.
Each opening requires only one specific or main qualification.
When a candidate matches the qualification, the job is assigned, and an entry is made in the Placement Record folder. That folder contains an opening number, a candidate number, the total hours worked, etc. In addition, an entry is made in the job history for the candidate.
An opening can be filled by many candidates, and a candidate can fill many openings.
TEC uses special codes to describe a candidate’s qualifications for an opening.

TEC’s management wants to keep track of the following entities:

COMPANY
OPENING
QUALIFICATION
CANDIDATE
JOB_HISTORY
PLACEMENT
COURSE
SESSION

Given that information, do the following:

Draw the Chen ERDs for this enterprise.
Identify all possible relationships.
Identify the connectivity for each relationship.
Identify the dependencies for the relationships.
Resolve all M: N relationships.

# Entity-Relationship Diagram (ERD) Overview

This Entity-Relationship Diagram (ERD) illustrates the relationships between various entities in a job placement context. Understanding this diagram is fundamental for designing databases related to human resource management, job placements, and educational courses offered to candidates. Below is a detailed explanation of each entity, relationship, and attribute used in this ERD:

## Entities:
1. **CANDIDATE**:
- Represents individuals looking for job opportunities.

2. **OPENING**:
- Represents job openings or vacancies within companies.
- Attributes: `companyName`, `openingNum`, `requiredQual`

3. **COURSE**:
- Represents educational courses available for candidates.

4. **SESSION**:
- Represents different sessions for courses.

5. **QUALIFICATION**:
- Represents the qualifications or certifications a candidate can earn.

6. **JOB_HISTORY**:
- Represents the past job positions held by candidates.

7. **PLACEMENT**:
- Represents placement records indicating the job openings filled by candidates.
- Attributes: `openingNum`, `totalHrsWorked`, `candidateNum`

8. **COMPANY**:
- Represents the companies offering job opportunities.

## Relationships:
1. **DESCRIBE**:
- A candidate can have multiple qualifications.
- Relationship between `CANDIDATE` and `QUALIFICATION`:
- Many-to-Many (M:N) Relationship.

2. **FILL**:
- Candidates fill job openings.
- Relationship between `CANDIDATE` and `OPENING`:
- Many-to-Many (M:N) Relationship.

3. **REQUIRE**:
- Job openings may require specific qualifications.
- Relationship between `OPENING` and `QUALIFICATION`:
- One-to-One (1:1) Relationship.

4. **MADE**:
- Represents job histories made by candidates.
- Relationship between `CANDIDATE` and `JOB_HISTORY`:
- One-to-One (1:1) Relationship.

5. **OPENS**:
- Job openings create placements.
- Relationship between `OPENING` and `PLACEMENT`:
- One-to-Many (1:N) Relationship.

6. **HAS**:
- Courses have multiple sessions.
- Relationship between `COURSE` and `SESSION`:
- One

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