Postgres 15 improves UNIQUE and NULL

Tech & AIblog.rustprooflabs.comSince 2019

Postgres 15 improves UNIQUE and NULL

Quick read

A short blog post explaining Postgres 15u2019s new UNIQUE NULLS NOT DISTINCT option. It shows how this option makes UNIQUE constraints treat NULLs as equal so repeated NULLs can be prevented.

  • Explains difference between old and new UNIQUE behavior with NULLs
  • Shows example tables demonstrating enforcement change
  • Notes default behavior remains unchanged unless option used

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Postgres 15 improves UNIQUE and NULL was shared on NexURLs by skilo on October 17, 2026, in Tech & AI.

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