Data warehouse ODS, DWD floor, 220616, HM,

Enterprise development and growth ： Apply first Re theory

Training development and growth ： Pre theory Then apply

Theory and practical application Will there be any deviation

Premise ： Understand and grasp Technology

Technique is icing on the cake , Technology is the foundation of the body

Drop taxi

2-3 become ,

Three level linkage , Father id,

 

 

 

 

 

 

 

  Table name ctrl+q, Table structure and content ,

f4 Console ,

Change fields

 

 

 

 

 

hide hive library

 

 

MATLAB

Chinese cabbage , Old peach , System installation ,

 

 

Small amount of data

 

 

 

 

 

 

 

 

 

 

 

 

 

Hcatalog Only those with consistent field names can be matched

 

 

 

 

 

 

 

The company will see if there is updata_time, contrast , See if it can be updated ,

 

 

ods The emergence of layer will understand and couple the business system database and data warehouse system

Decoupling

 

 

 

The facts Is to analyze the content of concern

 

1、 To keep historical data 2、 Data should not be redundant

 

 

 

 

 

 

 

 alt+enter, Auto complete fields ,

 

 

 

 

 

  Avoid direct coverage of wrong data ,

 

  Completed ：：：：：：：：：：：：：