Discussion
In the relational model, relationships between relations or tables are created by using:
Answer: D
Correct answer: foreign keys.
A relationship is represented by placing the key of one relation into another as a foreign key, so a row in the second can be matched to exactly one row in the first. The relational model has no pointers and no explicit links; every relationship is expressed by matching values, which is what allows relations to be joined in any combination.
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