In a database table, which column is often used as the basis for creating an index?

In a database table, the column often used as the basis for creating an index is the primary key. A primary key uniquely identifies each record in the table, making it an ideal candidate for indexing to improve data retrieval speed. Indexing the primary key allows for fast lookup and retrieval of specific records based on their unique identifiers. Other columns, such as foreign keys, unique constraints, or timestamps, may also be indexed based on the specific requirements of the application and the types of queries being executed. However, primary keys are the most common choice for indexing in database tables.