Final Answer:
The ER diagram for the ABC Company's application would have entities for "Employee" and "Project" linked by a many-to-many relationship. The Employee entity includes attributes such as Emp_No (unique identifier), first name, middle name, and last name. Similarly, the Project entity comprises attributes for a unique project number and name.
Explanation:
The ER diagram reflects the relationship between employees and projects in the ABC Company's database structure. Firstly, the Employee entity consists of the unique identifier Emp_No as a primary key along with attributes for the employee's name—first name, middle name, and last name. Each employee is uniquely identified by their Emp_No, ensuring no duplicity within the system.
On the other hand, the Project entity contains attributes for a unique project number and its name. This entity represents distinct projects within the company. Considering the relationship between employees and projects, it's a many-to-many association as multiple employees can work on various projects, and each project can involve multiple employees simultaneously.
To establish this many-to-many relationship, an associative entity (commonly known as a junction table) is needed. This intermediary entity stores pairs of primary keys from both Employee and Project entities. By creating this association, the ER diagram accurately models the scenario where employees are assigned to multiple projects and each project involves several employees.
The ER diagram's entities and their relationships depict a structured representation of how employees and projects are linked within the ABC Company's application, ensuring data integrity and facilitating efficient data management through a relational database system.