. What is a Primary key?*1 pointA. Foreign KeyB. Unique KeyC. Database keyD. format key

A primary key is a specific type of database key. It is used in relational databases to uniquely identify each record in a table. A primary key ensures that no two records can have the same value in the primary key field, making it essential for maintaining the integrity of the data.

Answer Analysis:

• Option A: Foreign Key - A foreign key is a reference to a primary key in another table and is not used for uniquely identifying records in its own table.
• Option B: Unique Key - While a unique key also ensures uniqueness, it can allow for NULL values, whereas a primary key cannot.
• Option C: Database Key - This is a generic term and does not specifically refer to the concept of primary keys.
• Option D: Format Key - This does not pertain to the concept of primary keys in databases.

Final Answer:

The correct answer is C. Database key, but considering the context, the primary key is ultimately a type of database key designed for unique identification.