Perhaps your "C" drive has a serial number, and it's replaced - then the dimension will expire and a new dimension is added. These things about a dimension are not really "facts", they are attributes. This wouldn't affect reporting because the data for computer X, drive C has continuit...
Is it true that facts in a fact table of a data warehouse always have a relation to time? I.e. is it true that a fact must always be assignable to a specific point in time? If this is correct, can we conclude that dimension elements (except for maybe a time-dimension) ...
In Data Warehouse Modeling, a star schema and a snowflake schema consists of Fact and Dimension tables. Fact Table: It contains all the primary keys of the dimension and associated facts or measures(is a property on which calculations can be made) like quantity sold, amount sold and average...
1、.Fact Tables and Dimension TablesThe logical foundation of dimensional modeling by Ralph Kimball January 1, 2003Dimensional modeling is a design discipline that straddles the formal relational model and the engineering realities of text and number data. Compared to entity/relation modeling, it's ...
DataWarehouse - Fact Tables with different granularity / Dimension measures I've got data in the following format. RoadAccidents (pk_accidentIdentifier)with relationship1..*toVehicles(fk_accidentIdentifier, ordinalNumber)->natural PK (compound) and surrogate, which is simply arowID)....
why you have the fields in the fact table that you do as they are duplicated in the dimension...
why you have the fields in the fact table that you do as they are duplicated in the dimension...
eg: same dimension value are using in factsales table and factpayments table conformed dimension 1.1.2 Junk Dimension A junk dimension is a handy grouping of data this is not necessarily used in any analysis Data used such as flags or markers must still be used in a data warehouse to help...
Fact and dimension tables are used together in astar schema(or the closely relatedsnowflake schema) to organize information in a data warehouse. You may want to build a fact table if: Your data sources (the systems that generate data, such as your application database) only store a current...
reference the dimension tables. The foreign keys make it possible to access the dimensions' attributes, which contain information about the customers, products, territories and dates involved in each sale. Thewarehouse datacan be filtered by any combination of attributes available in the dimension ...