Which identifier references a column in which each value is unique within a table?

Rationale

Primary key uniquely identifies each value within a table.

A primary key is a specific column or set of columns in a database table that is designated to uniquely identify each row in that table. This uniqueness ensures that no two rows can have the same value in that column, which is essential for maintaining data integrity.

A (Foreign key) YOUR ANSWER

A foreign key is a column or set of columns that creates a link between two tables by referencing the primary key of another table. It does not ensure uniqueness within its own table; rather, it allows for repeated values as it establishes relationships between different tables in a relational database.

B (Structured database) YOUR ANSWER

The term "structured database" refers to a database that is organized in a defined manner, typically in tables. It does not specifically refer to any column or identifier and therefore does not imply uniqueness of values within a column. This term describes the overall format rather than a specific attribute.

C (Primary key) CORRECT

The primary key is the correct answer because it is specifically defined to ensure that each value in the column is unique within the table. This guarantees that each row can be distinctly identified, which is crucial for database operations such as data retrieval and integrity maintenance.

D (Relational database) YOUR ANSWER

A relational database is a type of database that organizes data into tables that can be linked—or related—based on data common to each. While it involves the use of primary keys and foreign keys, it does not refer to a specific column or identifier that guarantees uniqueness.

Conclusion

In summary, the primary key serves as the unique identifier for each row within a database table, ensuring data integrity and facilitating efficient data management. In contrast, foreign keys, structured databases, and relational databases describe broader concepts or relationships that do not specifically pertain to unique identification of values within a single column.

Which identifier references a column in which each value is unique within a table?

Primary key uniquely identifies each value within a table.

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