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Which of the following is an attribute in one relation that has values matching the primary key in other relation?
Alternate key
Foreign key
Secondary key
Primary key
Wrong subject area This is a database question. But the answer is Foreign Key. A Primary key is intended to be a unique identifier for a database row. A secondary key is used if the intended primary key is not quite unique (say last name, smith) so add more stuff. A foreign key is used to connect tables; the secondary key is the primary key in a different table. An alternate key is another unique identifier for the row (why, because it is).
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