What is factless fact table?
A factless fact table is a fact table that does not have any measures. It is essentially an intersection of dimensions (it contains nothing but dimensional keys). There are two types of factless tables: One is for capturing an event, and one is for describing conditions.
What are aggregate fact tables?
Aggregate fact tables are simple numeric rollups of atomic fact table data built solely to accelerate query performance. These aggregate fact tables should be available to the BI layer at the same time as the atomic fact tables so that BI tools smoothly choose the appropriate aggregate level at query time.
What are the different types of fact tables?
There are three types of fact tables:
- Transaction Fact Table. The transaction fact table is a basic approach to operate the businesses.
- Snapshot Fact Table. The snapshot fact table describes the state of things at a particular time and contains many semi-additive and non-additive facts.
- Accumulated Fact Sheet.
What is the meaning of Factless?
Lacking facts; inaccurate or fictional. adjective.
What are Factless facts in Microstrategy?
A factless fact table is table that doesn’t have fact at all. They may consist of nothing but keys. There are tow types of factless fact table.
Why do we need aggregate fact tables explain with an example?
So the reason why aggregates can make such a dramatic increase in the performance of the data warehouse is the reduction of the number of rows to be accessed when responding to a query. A fact table consists of the measurements, metrics or facts of a business process.
What is a fact table used for?
A fact table stores quantitative information for analysis and is often denormalized. A fact table works with dimension tables. A fact table holds the data to be analyzed, and a dimension table stores data about the ways in which the data in the fact table can be analyzed.
What is the importance of fact table?
Fact tables provide the (usually) additive values that act as independent variables by which dimensional attributes are analyzed. Fact tables are often defined by their grain. The grain of a fact table represents the most atomic level by which the facts may be defined.
What are three types of facts?
We can divide the Facts in to these three types.
- Non-Additive.
- Semi-Additive.
- Additive.