SCD - Slowly Changing Dimension in Data Warehouse
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- Опубликовано: 26 янв 2018
- Title: Slowly Changing Dimensions | All you need to know about SCD
Description -
Slowly changing dimension is a way of accommodating/adjusting changes in dimensions.
In this video, we will learn about slowly changing dimensions. SCD or Slowly Changing Dimensions is a common dimensional scenario, that comes in data warehouses but it is a critical design process for developers. We will dive down to understand different approaches - type 1, type 2 and type 3 and corresponding techniques to deal with each of them.
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Please upload more videos on dimensional modelling and kimball methodology. Thanks for your work.
@aroundBI can you pls share the ppt for this playlist?
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Very helpful, Thank!
In our datawarehouse we use type 2 with processdate. This is the date when the data was entered into the table. This allows us to see historical snapshots of data. Which is useful when you are analyzing trends like balances. So you can see how balances change overtime.
Very helpful content in very easy words !! Thank you !!
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Please don't delete this playlist
Data warehouse aroundbi
Very important playlist from your channel in my career
How the delete is handled in SCD Type 2? If record is deleted in source then which will be displayed as active record?
How to apply partioning on scd type 2
Good
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Very helpful diagram at 11:43
good
need more videos on schema types pleasee.
In Type 2 dimensions, End Date is never a null value. It will be always 12/31/9999.
what is the process of updating the surrogate key of related tables?
Thanks for the video. Easy to understand. But aren't there 6 types of SCD?
Type 1 and Type 2 you will see mostly used in real world, rarely type 3. These 3 are the main ones used
I prefer type 1 and 3, the option 3 is the most complicated of them all.
can we do scd2 without surrogate key? please reply
Yes
@@s13gaming68 how
as i have searched for it but dont get any
@@sanjeevansalvi3683 you can still have primary key of application joined with fact in case of scd2 but make sure put filter on either effective date or current indicator colomn
@@s13gaming68 thank you
Excellent explanation with examples , one of the best playlist on DWH concepts in You tube ,can you please also make some videos
Good Reference Vids for any interview this will brush up all the foundations for any experience levels
well done doing great job
**short note
EXPIRY_DATE - instead of null a standard practice is to use high end date - 31/12/9999
Rapidly Changing Dimensions
Role Playing Dimensions
Galaxy /Factless Schema
Super Keys
Candidate Keys
C R I S P 👏