# Overview A **Slowly Changing Dimension (SCD)** is a type of dimension table in a data warehouse where the attributes **change infrequently over time**, and you need a strategy for **tracking or preserving those changes**. The types of Slowly Changing Dimensions include: - **Type 1:** Overwrite old value (no history). - **Type 2:** Add a new row with timestamps or flags (full history). - **Type 3:** Store limited history in additional columns. # Key Considerations # Implementation Details # Useful Links # Related Topics ## Reference #### Working Notes #### Sources