The rules for combining and manipulating relations; for example De Morgan's law, "the complement of a union is equal to the union of the complements."
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2009 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- Out of context patterns
- Out of context patternsDabbleDB instead of SQL?On Janurary 19, Jon Udell interviewed the folks at DabbleDB and discussed the problem of SQL's limited horizon that you mentioned and how an emergent style of database interaction might help, at: http://blog.jonudell.net/2007/01/19/a-conversation-with-avi-bryant-and-andrew-catton-about-dabble-db/Why the point about SQL?What's you're reasoning behind it? Sure, SQL...
- Discussion threads 2007-01-30
- Development vs. Coding
- Development vs. CodingThe shopping is the shopping listSo we don't need a shopping list do we?What's wrong with this picture?CRUDYou're still a DP guy yourself at heart if you use terms like this.You don't create or read anything in a relational database, wholly misleading and inappropriate terminology.And update and delete...
- Discussion threads 2006-09-26
- Market is expressly ready for a real, high-end OSS relational database
- Market is expressly ready for a real, high-end OSS relational databaseThe right direction to go inThe Wikipedia article is, correctly, highly critical of existing RDBMS implementations. The future is dropping SQL and delivering an RDBMS that actually implements the relational model properly.Wind and Americas Cup CompetitionFor Oracle to suck the...
- Discussion threads 2006-08-22
- The meaning of "relational"
- The meaning of "relational"Nice try, but not quite thereI would strongly recommend C. J. Date's "Database in Depth" for anyone interested in a very clear explanation of relational theory. Set theory is important of course but not, I think, as central as predicate logic; we are not just interested in...
- Discussion threads 2006-06-06
- Database sales show some life
- Database sales show some lifeNone of these products are relationalJust a reminder that no product based on SQL can properly be called relational. This has serious consequences in terms of impaired consistency, productivity and performance.??Isn't SQL based in relational calculus?Not reallyIf you take the time to study the theory then...
- Discussion threads 2005-03-07
Neighboring Terms
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