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Slowly Changing Dimensions

When a customer changes their region, every historical fact silently lies — unless you've modeled the change. SCD types 1/2/3/6, effective-dating, bitemporal, and the production anti-patterns that bite teams in their first year.

When a customer changes their region, every historical fact silently lies — unless you've modeled the change. SCD types 1/2/3/6, effective-dating, bitemporal, and the production anti-patterns that bite teams in their first year.

Intermediate9 chapters· 1h 52m· in Semantic & Metrics Layer
See these SCD types in action — live. Replay a change timeline and watch the dimension transform under Type 0/1/2/3/4/6, then explore the join trap, storage cost, and bitemporal corrections — 100% in your browser. Open the SCD Playground →

Course content

  1. 01Lab SetupFree
  2. 02The SCD Problem in One SlideFree
  3. 03SCD Type 1 — Overwrite, and What You Just Lost🔒
  4. 04SCD Type 2 — Effective Dating Done Right🔒
  5. 05SCD Type 3 — The Limited History Trick🔒
  6. 06SCD Type 6 — Hybrid (1+2+3)🔒
  7. 07Bitemporal Modeling🔒
  8. 08Late-Arriving Dimensions and Facts🔒
  9. 09SCD Anti-Patterns in the Wild🔒

Prerequisites

↗Dimensional Modeling Fundamentals

What to learn next

↗Conformed Dimensions & the Bus Matrix· next

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