Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!rochester!rit!cci632!ccicpg!felix!asylvain From: asylvain@felix.UUCP (Alvin E. Sylvain) Newsgroups: comp.databases Subject: Re: Outerjoin implementation? (4-valued question) Summary: What the hey is 4-valued logic? Message-ID: <152008@felix.UUCP> Date: 4 Oct 90 23:17:54 GMT References: <5803@plains.NoDak.edu> <30203@netnews.upenn.edu> Sender: daemon@felix.UUCP Reply-To: asylvain@felix.UUCP (Alvin E. Sylvain) Distribution: comp Organization: FileNet Corp., Costa Mesa, CA Lines: 18 In article cimshop!davidm@uunet.UU.NET (David S. Masterson) writes: [ ... ] >This is better known as 3-valued logic which is a part of the relational model >(as is 4-valued logic). Both answers (to both problems) are syntactically >correct, the true answer is determined by the semantics of the problem (which >you touched on at the end). [ ... ] >BTW, do current OODBs treat 3 or 4 valued logic? I imagine they could, but do >current implementations even address this? Whoa, wait a minute! Can you explain to this meager humble dum-dum what is 4 valued logic? If this is explained much deeply in some periodic list of FAQ that I failed to locate, please to forgive! -- =======================Standard Disclaimers Apply======================= "We're sorry, but the reality you have dialed is no | Alvin longer in service. Please check the value of pi, | "the Chipmunk" or pray to your local diety for assistance." | Sylvain