When considering creating a join between two tables, how are we demonstrating the concept of "relational" databases? Why is it essential to create the join by finding a unique, unique attribute in at least one table and looking at situations where that attribute has the same value ( is equal ) in both tables

Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter9: Joining Data From Multiple Tables
Section: Chapter Questions
Problem 10RQ
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When considering creating a join between two tables, how are we demonstrating the concept of "relational" databases? Why is it essential to create the join by finding a unique, unique attribute in at least one table and looking at situations where that attribute has the same value ( is equal ) in both tables?

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