An analyst used a column of a table to uniquely identify each record within a table. Which tool did they use?

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Multiple Choice

An analyst used a column of a table to uniquely identify each record within a table. Which tool did they use?

Identifying each row in a table relies on a primary key. The primary key is a column (or set of columns) whose values are unique for every row and typically cannot be null, ensuring that no two records are indistinguishable. This key provides a stable reference to each record and often links to related data in other tables via foreign keys. An index speeds up locating rows but doesn’t inherently establish unique identity for each row. A foreign key enforces referential integrity by pointing to a primary key in another table. A view is a saved query that presents data from one or more tables, not a mechanism to uniquely identify rows in the base table.

Identifying each row in a table relies on a primary key. The primary key is a column (or set of columns) whose values are unique for every row and typically cannot be null, ensuring that no two records are indistinguishable. This key provides a stable reference to each record and often links to related data in other tables via foreign keys. An index speeds up locating rows but doesn’t inherently establish unique identity for each row. A foreign key enforces referential integrity by pointing to a primary key in another table. A view is a saved query that presents data from one or more tables, not a mechanism to uniquely identify rows in the base table.

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