[email protected] (David L. Craig) writes: > GINYF when it doesn't equate trinary with trenary, a term > I had forgotten (I'm really trying to avoid turning this > thread into a career). At least it wasn't just a rumor. > +1 and thanks for causing me to be reminded of Minerva-- > perhaps someday Google will attain such capability.
for a little drift ... old (sql) post about 3-value logic and handling of nulls. about same time i was involved in original relational implementation ... some past posts http://www.garlic.com/~lynn/submain.html#systemr ... i also dragged in helping with a similar but different kind of relational implementation ... that had a different way of convention for 3-value logic (& nulls/unknowns). http://www.garlic.com/~lynn/2003g.html#40 How to cope with missing values - NULLS? part of the issue with sql 3-value logic and nulls/unknowns was that the results could be the opposite of what people assumed. 3-value logic reference (also trivalent, ternary, trinary, trilean) http://en.wikipedia.org/wiki/Three-valued_logic includes section http://en.wikipedia.org/wiki/Three-valued_logic#Application_in_SQL and references null (sql) http://en.wikipedia.org/wiki/Null_%28SQL%29 as well as references ternary computer http://en.wikipedia.org/wiki/Ternary_computer in the years since system/r & this other kind of relational ... i've re-implemented versions a number of times from scratch ... i use it for a number of things including ietf rfc (internet standards) index ... and merged glossaries and taxonomies http://www.garlic.com/~lynn/index.html other posts mentioning 3-value logic http://www.garlic.com/~lynn/2004l.html#75 NULL http://www.garlic.com/~lynn/2005.html#15 Amusing acronym http://www.garlic.com/~lynn/2005i.html#35 The Worth of Verisign's Brand http://www.garlic.com/~lynn/2005m.html#19 Implementation of boolean types http://www.garlic.com/~lynn/2005t.html#23 So what's null then if it's not nothing? http://www.garlic.com/~lynn/2005t.html#33 What ever happened to Tandem and NonStop OS ? http://www.garlic.com/~lynn/2006e.html#34 CJ Date on Missing Information http://www.garlic.com/~lynn/2006q.html#22 3 value logic. Why is SQL so special? http://www.garlic.com/~lynn/2006s.html#27 Why these original FORTRAN quirks? http://www.garlic.com/~lynn/2006x.html#21 "The Elements of Programming Style" http://www.garlic.com/~lynn/2006x.html#30 "The Elements of Programming Style" http://www.garlic.com/~lynn/2006y.html#1 "The Elements of Programming Style" http://www.garlic.com/~lynn/2009c.html#34 Is the Relational Database Doomed? http://www.garlic.com/~lynn/2009g.html#32 Old-school programming techniques you probably don't miss http://www.garlic.com/~lynn/2009r.html#65 You know you've been Lisp hacking to long when http://www.garlic.com/~lynn/2012o.html#8 Initial ideas (orientation) constrain creativity -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
