Answer to Question #136290 in Databases | SQL | Oracle | MS Access for Starlen

Question

For the relations s and r in your study manual of our chapter 1(i.e., joining two relations), suppose we type a collection of relational algebra queries, and get the following results.

.A B C D E
A 2 a 10 B
B 2 a 10 b

Please explain how this happened? If you think this result could happen in practice, please write the corresponding relational algebra queries; otherwise, please explain why.

Answer 1

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