Consider the following relational database schema consisting of the four  relation schemas: i. passenger (pid, pname, pgender, pcity) ii. agency (aid, aname, acity) iii. flight (fid, fdate, time, src, dest) iv. booking (pid, aid, fid, fdate) Answer the following questions using relational algebra queries; 1. Get the complete details of all flights to Kumasi. 2. Get the details about all flights from Accra to Kumasi. 3. Find the passenger names for passengers who have bookings on at least  one flight.

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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.