please pick one from below
Option 1: Logical Data Modeling—Employee/Manager Relationships
You are modeling the relationship of employees and managers in your organization. One possibility is to show a unary or recursive relationship on the EMPLOYEE entity. How would you model the cardinality of the unary relationship to indicate that an employee has one manager and a manager may have many employees? Draw the model to show that an employee must have a manager. Now draw the model to show that a manager must have at least one employee. What happens if a manager has only one employee assigned, and then that employee is reassigned? Draw the relationship with cardinalities to indicate that a manager may have no employees.
Your organization asks you to create a data model for employees participating in projects. One employee can participate in many projects. One project can have many employees assigned. Your stakeholders want to know the role of each employee on a project. Address the following questions in your paper:
- Which type of entity will help you model this many-to-many relationship?
- Is it possible for a project to have no employees assigned, and how would you model that possibility?
- Is it possible for an employee to be unassigned to any project, and how would you model that possibility?
Deliver this modeling assignment in a 2- to 3-page paper that includes your models and your responses to the questions provided herein. The CSU-Global Library is a good place to find these sources.
Include a title page and reference page. Make sure your paper follows APA style according to the CSU-Global Guide to Writing and APA Requirements. Cite two to three scholarly articles or pertinent trade journal articles to support your choices of logical models. (You may not use Wikipedia for any CSU-Global assignment.) For this assignment, a credible source is defined as:
- A scholarly or peer-reviewed journal article
- A newspaper article
- A trade or industry journal article, publication, or website, including those from trade organizations
Option 2: Logical Data Modeling for a Communication System
You are modeling an emergency communication system used to contact teachers in case inclement weather emergencies cause delayed openings or closures of the school. You may reach teachers by phone and/or email. The school must have at least one means of contact (phone or email) for each teacher. Each teacher may have more than one of each contact type. Which type of entity would you use in conjunction with the TEACHER entity to model a teacher’s contact information?
You decide to model a CONTACT table with primary key of Teacher-ID and Contact-Info, which is the contact information itself. The school principal, a major stakeholder, tells you she wants to track the area code for each teacher’s phone number(s):
- Will your original modeling concept work? If not, how would you change the model to reflect the principal’s request?
- How many entities would you need to represent the unique attributes of telephone numbers and email addresses so that no entity contained null values?
- The principal reminds you that every teacher must have at least one phone number, but having an email address is not a requirement. Where would you reflect the phone number constraint in your model?
Deliver this modeling assignment as a 2- to 3-page paper that includes your models and your responses to the questions provided herein.
Include a title page and reference page. Make sure your paper follows APA style according to the CSU-Global Guide to Writing and APA Requirements. Cite two to three scholarly articles or pertinent trade journal articles to support your choices of logical models. You may not use Wikipedia for any CSU-Global assignment. For this assignment, a credible source is defined as:
- A scholarly or peer-reviewed journal article
- A newspaper article
- A trade or industry journal article, publication, or website, including those from trade organizations
The CSU-Global Library is a good place to find these sources.
