Lesson 5: data warehouse construction (III)

Data warehouse DWS layer

dws Mainly to prevent double counting . The calculation results are saved to with a high dws. Improve data utilization
1.dws Which tables to create
The dimension table of the dimension model is the benchmark .dwd There is one dimension ,dws There is a table corresponding to it . Regional dimension -> Area width table , User dimension -> User wide table .
2.dws What is the table structure
dws A line of data , The current day summary behavior of a dimension object . A primary key is a dimension id, The remaining fields are the aggregate values of the measures of the fact table related to the dimension . Aggregate to days . One partition per day .