factless fact tables

Factless fact tables are used in data warehousing to record events or situations that don't have measurable quantities but are important for tracking occurrences. Instead of storing numerical data, these tables capture the presence or absence of a specific event, such as a student attending a class or a customer visiting a store. They connect different dimensions (like time, location, or person) to make it easy to analyze patterns and relationships. Essentially, factless fact tables serve as a record of activities or events, providing valuable context without containing numeric facts.