Data Mining And Business Intelligence (2170715)

BE | Semester-7   Winter-2018 | 03/12/2018

Q3) (a)

Differentiate Fact table vs. Dimension table

Fact Table | Dimension Table

Sr Fact Table Dimension Table
1 Measurements, metrics or facts about a business process. Companion table to the fact table contains descriptive attributes to be used as query constraining.
2 Located at the center of a star or snowflake schema and surrounded by dimensions. Connected to the fact table and located at the edges of the star or snowflake schema
3 Defined by their grain or its most atomic level. Should be wordy, descriptive, complete, and quality assured.
4 Fact table is a measurable event for which dimension table data is collected and is used for analysis and reporting. Collection of reference information about a business.
5 Facts tables could contain information like sales against a set of dimensions like Product and Date. Evert dimension table contains attributes which describe the details of the dimension. E.g., Product dimensions can contain Product ID, Product Category, etc.