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1. A Primary key must also be __

  • A. Foreign key
  • B. Foreign key
  • C. Foreign key
  • D. Foreign key

Answer: Option B

Explanation:

A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values. A table can have only one primary key, which may consist of single or multiple fields.

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