Question
What is a fact-less-fact?
Answers
A fact table that does not contain any measure is called a fact-less fact. This table will only contain keys from different dimension tables. This is often used to resolve a many-to-many cardinality issue.
Explanatory Note: Consider a school, where a single student may be taught by many teachers and a single teacher may have many students. To model this situation in dimensional model, one might introduce a fact-less-fact table joining teacher and student keys. Such a fact table will then be able to answer queries like,

Who are the students taught by a specific teacher.
Which teacher teaches maximum students.
Which student has highest number of teachers.etc. etc.   Your Comment




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