Design a relational database for a university registrar’s office. The office maintains data about each class, including the instructor, the number of students enrolled, and the time and place of the class meetings. For each student–class pair, a grade is recorded.
Answer to relevant QuestionsDescribe the differences inmeaning between the terms relation and relation schema. Illustrate your answer by referring to your solution to Exercise below.student (student-id, name, program)course (courseno, title, syllabus, ...The outer-join operations extend the natural-join operation so that tuples from the participating relations are not lost in the result of the join. Describe how the theta join operation can be extended so that tuples from ...Let R = (A, B, C), and let r1 and r2 both be relations on schema R. Give an expression in the domain relational calculus that is equivalent to each of the following: a. IIA(r1) b. σB =17 (r1) c. r1 ∪ r2 d. r1 ...Consider the relational database of Figure. Give an expression in SQL for each of the following queries.a. Modify the database so that Jones now lives in Newtown.b. Give all employees of First Bank Corporation a 10 percent ...SQL-92 provides an n-ary operation called coalesce, which is defined as follows: coalesce (A1,A2, . . . , An) returns the first nonnull Ai in the list A1,A2, . . .,An, and returns null if all of A1,A2, . . .,An are null. ...
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