# clm_96E744597CCF

subject: Databricks (/record/databricks.md)  
predicate: feature_added  
value: UNIQUE constraints  
valid_from: 2026-11-03  
valid_to: null  
published: 2026-11-03  
recorded: 2026-11-05  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-05  
checked: 2026-11-05 · its source page states the value and the date  

> UNIQUE constraints, now available in Public Preview for Unity Catalog Delta tables in Databricks SQL and Databricks Runtime 18.2 and above, add a way to record the other uniqueness guarantees.

What https://www.databricks.com/blog/declare-and-optimize-unique-constraints-databricks says, word for word.

## Sources

- https://www.databricks.com/blog/declare-and-optimize-unique-constraints-databricks (primary, Databricks, published 2026-11-03)

---

AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.