Not sure if term "singleton" is valid in relation database.

The term is valid in mathematics: The relational model is an extension of set theory, eg the algebra includes set operators such as union, intersection, difference... In the set theory, a singleton designate is a exactly-one-element set. At least Wikipedia and my dwindling memories tell me so:-)


Sent via pgsql-hackers mailing list (
To make changes to your subscription:

Reply via email to