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What is the relationship between facts and dimensions?
In most dimensions, each fact joins to one and only one dimension member, and a single dimension member can be associated with multiple facts. In relational database terminology, this is referred to as a one-to-many relationship. However, it is frequently useful to join a single fact to multiple dimension members.
What is the difference between a dimension and a fact?
Fact table contains measurements, metrics, and facts about a business process while the Dimension table is a companion to the fact table which contains descriptive attributes to be used as query constraining. Fact table helps to store report labels whereas Dimension table contains detailed data.
Can a entity be a dimension or a fact?
However, for some subject areas, it can be challenging – especially for the new dimensional modeler – to identify whether an entity is a dimension or a fact. For example, an insurance company’s claims processing unit wants to analyze and report on their open claims.
How are dimension attributes different from fact table?
The Dimension Attributes are the various columns in a dimension table Dimensions offers descriptive characteristics of the facts with the help of their attributes No set limit set for given for number of dimensions The dimension can also contain one or more hierarchical relationships.
Is the store a dimension or a fact?
A store’s sales, a telecommunication company’s phone calls, and a college’s course registrations are all clearly facts. However, for some subject areas, it can be challenging – especially for the new dimensional modeler – to identify whether an entity is a dimension or a fact.
Which is the best definition of a dimension table?
Often, the business users are most interested in seeing the current state of the process. A table with one row per process – one row per claim or sales opportunity, for example – sounds like a dimension table.