- A A key used for sorting data in a table
- B A key used for joining two tables
- C A key that uniquely identifies a row in a table
- D A key that represents a relationship between tables
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Answer:
C
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A primary key is a column or a set of columns in a table that uniquely identifies each row. It ensures that each row in the table has a unique identifier, which is essential for data integrity and efficient data retrieval.
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