Type IV
The Type 4 method is usually referred to as using "history tables", where one table keeps the current data, and an additional table is used to keep a record of some or all changes.
For the above example the original table name is Supplier and the history table is Supplier_History.
| Supplier_key | Supplier_Code | Supplier_Name | Supplier_State |
|---|---|---|---|
| 123 | ABC | Acme Supply Co | IL |
| Supplier_key | Supplier_Code | Supplier_Name | Supplier_State | Create_Date |
|---|---|---|---|---|
| 123 | ABC | Acme Supply Co | CA | 22-Dec-2004 |
This method resembles how database audit tables and change data capture techniques function.
Read more about this topic: Slowly Changing Dimension
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