What uniquely identifies each row in a table?1 pointThe primary key of a relational tableThe textual dataThe secondary key of a relational tableThe columns

The correct answer to the question "What uniquely identifies each row in a table?" is The primary key of a relational table.

Explanation:

1. Primary Key: This is a specific choice of a minimal subset of attributes (columns) that uniquely identifies each row in a table. Every table in a relational database is expected to have a primary key, ensuring that no two rows have the same values for the key attributes.

2. Textual Data: While textual data can form part of a primary key, it alone does not uniquely identify a row unless explicitly designated as a primary key.

3. Secondary Key: A secondary key is an attribute or set of attributes that can also be used for sorting or querying data but does not guarantee uniqueness of each row.

4. Columns: Columns represent the attributes of the data but do not uniquely identify rows unless they are structured as a primary key.

Thus, the primary key is essential for establishing a unique identity for each record in the relational database table.