Web Reference: In this tutorial, you will learn about PostgreSQL 18 Temporal Constraints, which allow you to enforce time-based data integrity using the WITHOUT OVERLAPS clause for primary keys and unique constraints, plus the PERIOD clause for foreign keys. Oct 22, 2025 · Learn how PostgreSQL 18's temporal constraints use WITHOUT OVERLAPS and PERIOD clauses to enforce time-based data integrity for bookings, history, and scheduling. Nov 6, 2025 · With this addition, you can now define UNIQUE, PRIMARY KEY, or FOREIGN KEY constraints by either Date Range or Timestamp Range fields, making it easier than ever to prevent overlapping data.
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