Answer-In a relational database, which key uniquely identifies tuples within a table and can never contain...

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A Primary Key uniquely identifies each record or tuple in a table and cannot contain NULL values. It enforces entity integrity, ensuring that every row in a table has a unique identifier. For example, in a table of employees, an employee ID serves as a primary key, ensuring no duplicate or NULL entries exist.   Why Other Options Are Incorrect    Foreign Key Links one table to another and can contain NULL values in some cases its purpose is to enforce referential integrity, not uniqueness within its table.   Candidate Key A potential key that can uniquely identify tuples but is not chosen as the primary key.   Alternate Key A candidate key not selected as the primary key but still capable of uniquely identifying records.   Composite Key A primary key consisting of multiple columns but is a type of primary key, not a separate concept.

In a relational database, which key uniquely identifies tuples within a table and can never contain NULL values?

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