For row queries, what is an important guideline regarding database interaction?

Accessing only selected data columns from the database is an essential guideline for row queries because it optimizes performance and resource usage. When you restrict your queries to only the relevant columns needed for a specific operation or report, you reduce the amount of data transferred over the network and decrease the load on the database server. This approach not only enhances query execution speed but also minimizes memory consumption within the application.

Selecting only the necessary columns is particularly crucial in large datasets where retrieving all data can significantly slow down performance and lead to unnecessary processing overhead. By being selective, you also improve clarity in your code and maintainability since it becomes clear which data is relevant for your task. This practice aligns with efficient database management principles, promoting better system performance and a more responsive user experience.