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Lesson 5: data warehouse construction (III)
2022-06-12 05:26:00 【Big data learning enthusiasts】
Data warehouse
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 .
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