PGCon2010

PGCon 2010

Welcome to our feedback system. It collects feedback so that we have a chance to know what you think about the events of this conference.

Not Just UNIQUE

Exclusion Constraints

UNIQUE is no longer unique among constraints. I authored "Exclusion Constraints" for PostgreSQL 8.5: a more general constraint mechanism that can enforce constraints such as "non-overlapping" as well as unique; and can enforce constraints on GiST or hash indexes as well as BTree. See why other constraint mechanisms are unsuitable for common business requirements -- like handling schedule conflicts -- and how the problems are solved by using Exclusion Constraints.

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