--- title: "PostgreSQL 18 - Temporal Constraints" url: https://daily.dev/posts/postgresql-18---temporal-constraints-bygll79le source_url: https://hashrocket.com/blog/posts/postgresql-18-temporal-constraints type: article source: "Hashrocket" published: 2025-11-06T14:08:33.889Z updated: 2025-11-06T14:08:55.287Z tags: ["database", "sql", "postgresql"] reading_time: 4 upvotes: 32 comments: 1 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # PostgreSQL 18 - Temporal Constraints **[Hashrocket](https://daily.dev/sources/hashrocket)** · 4 min read · 32 upvotes · 1 comments ## Summary PostgreSQL 18 introduces temporal constraints with the WITHOUT OVERLAPS syntax, enabling enforcement of uniqueness across time periods using date or timestamp ranges. This feature prevents overlapping data in scenarios like subscription management, where users can have multiple historical records but only one active entry at a time. The implementation uses range types (daterange or timestamprange) with GIST indexes and requires the btree_gist extension for UUID compatibility. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@williamsuarez** · 0 upvotes > I see that new feature very usefull for applying constraints without trigger o logic in the application. Thanks for sharing it! ## Similar posts on daily.dev - [PostgreSQL as a temporal database](https://daily.dev/posts/postgresql-as-a-temporal-database-ypp4bfcv5) · Planet PostgreSQL · 0 upvotes · 0 comments - [Looking Forward to Postgres 19: It's About Time](https://daily.dev/posts/looking-forward-to-postgres-19-it-s-about-time-chhpnhwmp) · Planet PostgreSQL · 0 upvotes · 0 comments --- Tags: [#database](https://daily.dev/tags/database), [#sql](https://daily.dev/tags/sql), [#postgresql](https://daily.dev/tags/postgresql) [View this post on daily.dev](https://daily.dev/posts/postgresql-18---temporal-constraints-bygll79le)