Consider the following relations for a database that keeps track of student enrollment in courses and the books adopted for each course: STUDENT(SSN, Name, Major, Bdate) COURSE(Course#, Cname, Dept) ENROLL(SSN, Course#, Quarter, Grade) BOOK ADOPTION(Course#, Quarter, Book_ISBN) TEXT(Book ISBN, Book Title, Publisher, Author) Draw a relational schema diagram specifying the foreign keys for this schema.

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Q: MS-DOS procedure that ends a programme while retaining some of its data?

A: Answer is given below-

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Q: What is "file handling" and why is it needed? Please describe in detail.

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A: The seven criteria for choosing the best file organizing system will be explained:

Q: What is the magic number that identifies Java class files?

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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.