Description: A generated column is a feature in databases that allows the creation of a column in a table whose value is automatically calculated from other columns in the same table. This type of column is particularly useful for optimizing data storage and querying, as it eliminates the need to store redundant information. Generated columns can be of two types: ‘virtual’, which do not take up disk space and are calculated at query time, and ‘stored’, which do take up space and are calculated at the time of inserting or updating data. This functionality allows developers and database administrators to simplify query logic, improve performance, and maintain data integrity. Additionally, generated columns can be used in indexes, which can further speed up search and filtering operations. In summary, generated columns are a powerful tool in SQL data manipulation and query optimization, facilitating access and management more efficiently.
