Problem
You will need to create an entity relation (E-R) diagram using the Crow's foot symbols that models the problem. This will include:
A. Summaries the ERM's components, and names the entities and their relationship (As given in the Textbook, p.143, Table 4.4)
B. All entities, relationships (including names) and attributes that are relevant,
C. Primary keys identified, and
D. Include relationship participation - participation (optional / mandatory) symbols and cardinality.
The E-R diagram should be completed using the standards of this unit. Use Microsoft Visio or draw.io to make the E-R diagram.
Case Study
Temporary Employment Registers is an Australian Government service from Careers@Services (CAS) Australia that places the temporary workers in companies. Their registers are open to people how are interested in non-ongoing or irregular employment with the government services. The temporary service office manager gives you the following description of the business:
CAS 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 Bachelor of Business Administration degree or a Microsoft Network Certification. And clearly, a candidate may have earned both a BBA and a Microsoft Network Certification. CAS offers courses to help candidates improve their qualifications. Every course develops one specific qualification; however, CAS 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, CAS 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. CAS also has a list of companies that request temporaries. Each time a company requests a temporary employee, CAS makes an entry in the Openings folder. That folder contains an opening number, a company name, required qualifications, a starting date, 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, and total hours worked. 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. CAS uses special codes to describe a candidate's qualifications for an opening.