Exercise 16.7 Consider the university enrollment database schema:
Student(snum: integer, sname: string, major: string, level: string, age: integer)
Class(name: string, meets-at: time, room: string, fid: integer)
Enrolled(snum: integer, cname: string)
Faculty(fid: integer, fname: string, deptid: integer)
The meaning of these relations is straightforward; for example, Enrolled has one record per student-class pair such that the student is enrolled in the class.
For each of the following transactions, state the SQL isolation level you would use and explain why you chose it.
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