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When the primary key of one relation is placed into a second relation, it is called a
Select one:
A. candidate key
B. foreign key
C. referential integrity
D. field key
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Final answer:

Primary and Foreign Keys in databases link tables and establish unique record identification.


Explanation:

Primary key uniquely identifies each record in a table, like an Employee ID.

Foreign key links tables by pointing to primary keys in other tables, like a Customer ID in an Orders table.

Primary and Foreign Keys serve as anchors for relational connections in a database.


Learn more about Database Keys here:

https://brainly.com/question/38185744


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