Primary keys on postgresql are unique (and non null). It’s not possible to change that behavior as it’s the definition of a PK field. You can thus create more

Primary keys on postgresql are unique (and non null). It’s not possible to change that behavior as it’s the definition of a PK field. You can thus create more UUID fields that are unique and non-null by specifying that instead of “primary key” on column creation. https://www.postgresql.org/docs/8.1/static/ddl-constraints.html https://www.postgresql.org/docs/8.1/static/ddl-constraints.h...