What is a factless table?

What is a factless table?

Factless tables simply mean the key available in the fact that no remedies are available. Factless fact tables are only used to establish relationships between elements of different dimensions. And are also useful for describing events and coverage, meaning tables contain information that nothing has happened.

What is factless fact table give example?

A factless fact table is a fact table that does not have any measures, i.e. any numeric fields that can be aggregated. For example, if you are modelling product sales, you can have a Sales fact table that will contain the dimension keys and, for example, the “amount” value/measure, to record the amount sold.

What is a dimension table in data warehouse?

A dimension table is a table in a star schema of a data warehouse. A dimension table stores attributes, or dimensions, that describe the objects in a fact table. In data warehousing, a dimension is a collection of reference information about a measurable event.

How do you define a fact table?

Fact tables are data structures which capture the measurements of a particular business process. The measurements (quantity, amount, etc.) are defined by the collection of related dimensions. This collection of dimensional keys is called the grain of the fact.

What is dimension in DW?

In data warehousing, a dimension is a collection of reference information about a measurable event. In this context, events are known as “facts.” Dimensions categorize and describe data warehouse facts and measures in ways that support meaningful answers to business questions.

What is the advantage of fact table?

Advantages of Fact Table. It contains quantitative information for analysis. It containing performance metrics are usually normalized. It can contain different measures like additive, semi-additive and non-additive.

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 a fact less fact table?

A factless fact table is a fact table that does not have any measures . It is essentially an intersection of dimensions. On the surface, a factless fact table does not make sense, since a fact table is, after all, about facts.

What does factless mean?

factless (comparative more factless, superlative most factless) Lacking facts; inaccurate or fictional.

What are characteristics of fact table?

Keys: Fact table consists of a key that is the combination or concatenation of all primary keys of various dimension tables associated with that fact table.

Fact Table Grain: Grain of the table means the level of the detail or the deepness of the information that is stored in the fact table.

Additive Measures: Attributes in the fact table can be fully additive,semi-additive or non- additive. Fully additive or additive measures are those that are added to all dimensions.

What type of fact table?

Types of Fact Table Transaction Fact Table This is a fundamental and basic view of business operations. It is used to represent an occurrence of an event at any instantaneous point of time. Snapshot Fact Table The snapshot gives the state of things at a particular instance of time or “picture of the moment”. Accumulating Fact Tables