We learned about the different parts of relational algebra. We came across two operations in this algebra: Cartesian Product and

We learned about the different parts of relational algebra. We came across two operations in this algebra: Cartesian Product and

Question:

We learned about the different parts of relational algebra.  We came across two operations in this algebra:  Cartesian Product and Joins.  We were told that Cartesian Products and Joins have something in common and that Joins were a special case of a Cartesian Product.

Assume that you are to do an inner join between two tables A and B over a specific condition c.  In the output of your query, you would wish for only some of the columns to be reordered and for them to be relabeled to prevent the A.____/B.____ concept.  You have forgotten how to write a Join.  Which four relational algebra operations do you need for this task?  Why do you need them?

Expert Answer:

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To perform an inner join between two tables A and B reordering and relabeling columns to prevent the
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