Datomic Knowledgebase - Recent questions tagged :db.cardinality one https://ask.datomic.com/index.php/tag/%3Adb.cardinality+one Powered by Question2Answer Why is :db.unique/identity only allowed on :db.cardinality/one? https://ask.datomic.com/index.php/690/why-is-db-unique-identity-only-allowed-on-db-cardinality-one <p>I'm curious about the rationale for only allowing :db.cardinality/one attributes to be :db.unique/identity? An immediate use case in the wild is email addresses, which uniquely identify an individual but an individual can have many email addresses.</p> On-Prem https://ask.datomic.com/index.php/690/why-is-db-unique-identity-only-allowed-on-db-cardinality-one Tue, 21 Dec 2021 18:21:49 +0000