dimensional-modeling

Handling multiple fact tables in Qlikview

99封情书 提交于 2019-12-04 01:24:20
问题 I have a PostgreSQL database containing various education data such school-level test scores and enrollment figures. I need to separate enrollment from test scores because the data is on different grains. Even though enrollment is on a different granularity from the test-score data, many of the dimensions are the same. For example, I have: ~ ---------------------------------------------------------------------------------~ | Test Scores Fact | |-------------|-----------|----------|-----------

Star-Schema Design [closed]

假如想象 提交于 2019-11-27 16:38:07
Is a Star-Schema design essential to a data warehouse? Or can you do data warehousing with another design pattern? ConcernedOfTunbridgeWells Using star schemas for a data warehouse system gets you several benefits and in most cases it is appropriate to use them for the top layer. You may also have an operational data store (ODS) - a normalised structure that holds 'current state' and facilitates operations such as data conformation. However there are reasonable situations where this is not desirable. I've had occasion to build systems with and without ODS layers, and had specific reasons for