Question { 5422 }

what is fact less fact give me proper example?

Answer

A fact-less fact is a fact table in which only primary keys
of the dimension tables are present as foreign keys but no
measure/fact columns.
There are 2 types of factless fact table:
a) Event Tracking Tables: A table that records an event.
Example: A table that records student attendance. It
contains date_key, student_key, teacher_key, course_key,
without any measure section.
b) Coverage Tables: A table to answer questions about
things that didn't happen.
Example: An ordinary fact table cannot answer questions
like "Which products were on promotion that did not sell?",
because it contains only the records of products that did
sell. A table contains date_key, product_key, store_key,
promo_key and without measure section is used to answer
such questions.