Sql Postgresql Unique Constraint Or - Latest Information & Updates 2026

Web Reference: Feb 26, 2026 · A foreign key must reference columns that either are a primary key or form a unique constraint, or are columns from a non-partial unique index. This means that the referenced columns always have an index to allow efficient lookups on whether a referencing row has a match. I've already created the table and have lots of data in it (which I have already ensured meets the unique criteria). As it gets larger, though, room for error creeps in. Jul 15, 2025 · In PostgreSQL, the UNIQUE constraint is a powerful tool used to ensure that values stored in a column or a group of columns are unique across rows in a table. This constraint is essential for maintaining data integrity, especially when certain data should not be duplicated.

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Last Updated: April 4, 2026

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