5 SCD Patterns Using One Table

Real world SCD scenarios. No toy examples.

This template uses actual warehouse-style data changes you’ll see on the job

address updates, corrections, history tracking, and hybrid patterns.

✅ How to use this template

👉 Copy paste SQL into your favorite SQL editor

👉 Re-run queries

👉 Observe how rows change before vs after

Works with:

MySQL, SQL Server, PostgreSQL, Snowflake, Redshift, BigQuery

(any system supporting standard SQL logic)

🗂️ One Common Dimension Table (Setup Once)

CREATE TABLE dim_customer (
    surrogate_key INTEGER GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
    customer_id INTEGER,
    name VARCHAR(100),
    current_city VARCHAR(50),
    previous_city VARCHAR(50),
    start_date DATE,
    end_date DATE,
    is_current BOOLEAN
);

⚠️ MySQL users

Replace GENERATED ALWAYS AS IDENTITY with AUTO_INCREMENT

🧱 SCD TYPE 0 – Never Change