You want to implement SCD Type 2 in dbt for a customer dimension. Which combination of columns should you include to correctly track history and identify current records?

hard🚀 Application Q15 of 15

dbt - Advanced Patterns

Acustomer_id, name, effective_from, effective_to, is_current

Bcustomer_id, name, last_updated, deleted_flag

Ccustomer_id, name, created_at, updated_at

Dcustomer_id, name, version_number, is_active

Step-by-Step Solution

Solution:

Step 1: Identify key SCD Type 2 columns
SCD Type 2 needs effective_from and effective_to timestamps plus a flag like is_current to mark active rows.
Step 2: Compare options for completeness
customer_id, name, effective_from, effective_to, is_current includes customer_id, name, effective_from, effective_to, and is_current, covering history and current record tracking.
Final Answer:
customer_id, name, effective_from, effective_to, is_current -> Option A
Quick Check:
Effective dates + is_current = customer_id, name, effective_from, effective_to, is_current [OK]

Quick Trick: Use effective dates and is_current flag for SCD Type 2 [OK]

Common Mistakes:

MISTAKES

Using only timestamps without current flag
Confusing deleted_flag with is_current
Using version_number without effective dates

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You want to implement SCD Type 2 in dbt for a customer dimension. Which combination of columns should you include to correctly track history and identify current records?

Step 1: Identify key SCD Type 2 columns

Step 2: Compare options for completeness

Final Answer:

Quick Check:

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