The ER Model shown below is based on the following business rules. A manager manages one department. Each department is managed by one manager. An employee is assigned to one project. Each project is assigned many employees. Employee's salary cannot be less than 0. A project's end date cannot be earlier than its start date. UID (Unique identifier) uniquely identifies an instance of the entities. DEPARTMENT PROJECT DeptNo: UID DName ProjectNo: UID StartDate EndDate Location Is assigned is managed by is hired by ΕMPLOYEE EmpNo: UID EmpFName EmpLName EmpPhone Salary BirthDate manages iş supervised by Zipcode Supclvises Requirements 1 Based on the ER Model, write SQL statements to create EMPLOYEE, DEPARTMENT and PROJECT tables. • First, you'll need to do the relational modeling. In other words, map the ER model to the relational model (i.e., table structure with PK and FKs) • For each column, use the data type and length that you think appropriate. • Implement all necessary data integrity rules (e.g., entity integrity constraint, key constraint, referential integrity constraint, and semantic integrity constraints). • If necessary, make explicit assumptions.

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.