Assuming that we have an additional relation called staff which is union compatible with faculty, what will the following operation result in?Πname (Staff ⋂ Instructor)Select one:a.No rows being printedb.The cartesian product of instructor and staffc.All rows of instructor being added to all rows of staffd.The name of all rows which are in both staff and instructor
Question
Assuming that we have an additional relation called staff which is union compatible with faculty, what will the following operation result in?Πname (Staff ⋂ Instructor)Select one:a.No rows being printedb.The cartesian product of instructor and staffc.All rows of instructor being added to all rows of staffd.The name of all rows which are in both staff and instructor
Solution
The operation will result in option d. The name of all rows which are in both staff and instructor.
Here's why:
The operation is a combination of two operations: intersection (⋂) and projection (Π).
The intersection operation (⋂) is used to get the common tuples (rows) from two relations. In this case, it's getting the common tuples from Staff and Instructor.
The projection operation (Π) is used to select the specified attributes (columns) from a relation. In this case, it's selecting the 'name' attribute.
So, the operation Πname (Staff ⋂ Instructor) will select the 'name' attribute from the common tuples in Staff and Instructor. This means it will print the names of all rows which are in both Staff and Instructor.
Similar Questions
If we had another relation, staff, which was union compatible with faculty, what would the following expression return for a result?Πempno (Staff ⋃ Instructor)Select one:a.The employee number of every staff employee and every instructorb.Every employee who is either a member of the staff or an instructorc.All tuples of the instructor relation along with all tuples of the staff relationd.The employee number of all rows in the staff and in the instructor relations
Which of the following is this operation an example of?ΠName(Student) ⋈ ΠCourseID(Course)Select one:a.An equijoinb.A theta joinc.A natural joind.A cartesian product
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