What are different fact types?

What are different fact types?

There are three types of facts: Additive: Additive facts are facts that can be summed up through all of the dimensions in the fact table. Semi-Additive: Semi-additive facts are facts that can be summed up for some of the dimensions in the fact table, but not the others.

What is different type of fact tables dimension tables?

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. Thus, the fact table consists of two types of columns.

What type of table does the fact table deals with?

A fact table works with dimension tables and it holds the data to be analyzed and a dimension table stores data about the ways in which the data can be analyzed. Thus, a fact table consists of two types of columns.

What is transactional fact table?

A transactional fact table is a fact table where: Each event is stored in the fact table only once. It has a date column indicating when the event occurred. It has an identifier column which identifies each event. The number of rows is the same as the source table.

What should be 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. The primary key of a fact table is usually a composite key that is made up of all of its foreign keys.

What kind of measures are facts in a fact table?

Fact tables contain the content of the data warehouse and store different types of measures like additive, non additive, and semi additive measures. Fact tables provide the (usually) additive values that act as independent variables by which dimensional attributes are analyzed.

What fact table contains?

What is a 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). For example, you can have a factless fact table to capture student attendance, creating a row each time a student attends a class.

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 is fact table means?

A fact table is the central table in a star schema of a data warehouse. A fact table stores quantitative information for analysis and is often denormalized.

What is a fact dimension table?

A fact table is an entity representing the numerical measurements of the business. A dimension table is the entity describing the textual representation of the business.