Part 4/7:
One of the main advantages of database functions is their ability to include rows where only one of several criteria needs to be met (OR logic). For example, to sum invoices categorized as level one or those dated after a certain year, users simply need to list the criteria down the table, making it easy to expand or modify the filter conditions efficiently.
This flexibility extends to using the DSUM function for conditions that blend both AND and OR, allowing users to perform complex calculations without losing clarity.