Contents
Why some fact table are Factless?
Factless fact tables are used for tracking a process or collecting stats. They are called so because, the fact table does not have aggregatable numeric values or information. There are two types of factless fact tables: those that describe events, and those that describe conditions.
What is a bridge table called?
Associative tables are colloquially known under many names, including association table, bridge table, cross-reference table, crosswalk, intermediary table, intersection table, join table, junction table, link table, linking table, many-to-many resolver, map table, mapping table, pairing table, pivot table (as used …
What is the fact less fact?
Factless facts are those fact tables that have no measures associated with the transaction. Factless facts are a simple collection of dimensional keys which define the transactions or describing condition for the time period of the fact. It is a fact, plain and simple.
What should be included in a fact table?
In data warehousing, a fact table consists of the measurements, metrics or facts of a business process. It is located at the center of a star schema or a snowflake schema surrounded by dimension tables. Where multiple fact tables are used, these are arranged as a fact constellation schema.
How is an attribute bridge table similar to a factless fact table?
This is most evident when you look at an attribute bridge table, which links a dimension to an outrigger. It consists solely of foreign key references to the dimension and the outrigger. In this respect, the bridge table is very similar to a factless fact table .
Which is an example of a factless fact table?
In design tip 136, kimball’s example on bridge table, the bridge table looks like a factless fact table. I got used to have fact less tables for linking dimensions.
Which is the best way to build a fact table?
If you build your fact table from the lowest grain (the most detailed list of dimensions), you always get the ability to expand easily in the future. Although, you should keep in mind that it means your fact table will have more data rows. Every fact table will be related to one or more dimensions in the model.
How is a fact table different from a numeric table?
We know that fact table is a collection of many facts and measures having multiple keys joined with one or more dimesion tables.Facts contain both numeric and additive fields.But factless fact table are different from all these.