Is there a specific term to describe a relation with a cardinality of one?
I'm thinking particularly of RDBMS "special" one-row tables, for example, DUAL
(Oracle), SYSIBM.SYSDUMMY1
(DB2, Derby) and RDB$DATABASE
(Interbase, Firebird).
Is there a specific term to describe a relation with a cardinality of one?
I'm thinking particularly of RDBMS "special" one-row tables, for example, DUAL
(Oracle), SYSIBM.SYSDUMMY1
(DB2, Derby) and RDB$DATABASE
(Interbase, Firebird).
Singleton Table. In relational terms it is a relation with primary key ∅ (the empty set).