1993-01-01, English, Article, Journal or magazine article, Poster, chart, other edition: Nothing in excess: continuing the case against three-valued logic. (According to Date)(Column) (Tutorial) Date, C.J.

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Physical Description
  • chart
  • 1453 words
  • Tutorial
  • Magazine/​Journal article
Published
  • United Business Media LLC, 1993 Jan
Language
  • English

Edition details

Title
  • Nothing in excess: continuing the case against three-valued logic. (According to Date)(Column) (Tutorial)
Also Titled
  • Nothing in excess: continuing the case against three-valued logic.
Appears In
  • Database Programming &​ Design, v6, no.n1, 1993 Jan, p25(2) (ISSN: 0895-4518)
Author
  • Date, C.J.
Published
  • United Business Media LLC, 1993 Jan
Physical Description
  • chart
  • 1453 words
  • Tutorial
  • Magazine/​Journal article
Subjects
Target Audience
  • Trade
Summary
  • A previous column began a discussion of nulls and three-valued logic (3VL); most current products support (or attempt to support) 3VL even though the approach is fundamentally misguided. The 'unknown' truth value is not the same as 'truth value unknown,' but SQL3 includes a truth value data type called BOOLEAN that has only two values, 'true' and 'false,' with the third value, 'unknown,' represented by null. In two-valued logic (2VL), the four possible unary logical operators are one that maps both 'true' and 'false' into true, one that maps them both into 'false,' one that maps 'true' into 'false' and 'false' into 'true,' and one that leaves both 'true' and 'false' unchanged; 2VL has 16 possible binary operators. In 3VL there are 27 possible unary operators and 19,683 possible binary operators; how to determine a suitable set of 'primitive' operators and 'useful' operators in 3VL is discussed, and 3VL in SQL is examined.
Notes
  • chart
Terms of Use
  • COPYRIGHT 1993 United Business Media LLC
Language
  • English
Database
  • Gale General OneFile
Identifier
  • 13068489

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