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
Question
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
Solution
This operation is an example of c. A natural join.
In relational database theory, a natural join is a type of join which creates a new resulting table by combining column values of two tables (table1 and table2) based upon the join-predicate. The join-predicate arises from the WHERE clause and describes how columns from the two tables are matched to each other.
In this case, ΠName(Student) ⋈ ΠCourseID(Course) is a natural join operation where the Student table is joined with the Course table based on common attributes.
Similar Questions
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
Which of the following SQL keywords is used to perform a Cartesian product in SQL?JOINCROSS JOINUNIONINNER JOIN
Which of the following SQL keywords is used to perform a Cartesian product in SQL?
Which of the following is NOT an operation in relational algebra?
Equijoin is called as ______.Select one:a.Equal Joinb.Simple Joinc.Self Joind.Outer Join
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