Draw a Data Flow Diagram Level 0 and Level 1 of the following scenarios submit the pdf copy of the file in the eLearning. The passenger gives his travel details to checks available flights in the flight database, then the system will give back the flight details information back to the passenger. The passenger gives his personal details to books the flight and saves it in the flight database. The passenger pays by giving his credit account details then, itinerary receipt is given to the passenger. At any point, the manager can generate report from flight database.

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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.