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  • Re: Modeling based an existence chain

    Hi Ken, So, let me ask you a question about that object type you call "Organization(.type)". Did you mean it to represent a set of (possible) organization types (e.g. {'Federal','Public','NotListed'} )? If so, the name of the object type should be "OrganizationType", not "Organization" (and ...
    Posted to ORM Techniques (Forum) by Andy Carver on 05-24-2011
  • Re: Modeling based an existence chain

     Hi Andy, [quote user="Andy Carver"]From what I can tell, the domain (or to be precise, Marc's "watered-down version" of it) involves the idea that a person works for a federal agency or a Public Organization (or has no documented work), but does not do both. In other words, there is an ...
    Posted to ORM Techniques (Forum) by Ken Evans on 05-24-2011
  • Re: To Null or not to Null. That is the question!

    Ken, P.S. So I don't appear too biased for some people's tastes, I offer up an additional link, which at least gives both sides equal time -- in the persons of Messers Date and Codd: http://www.dbdebunk.com/page/page/1706814.htm
    Posted to ORM Techniques (Forum) by Andy Carver on 05-23-2011
  • Re: To Null or not to Null. That is the question!

    Hi Ken, You complained about Clifford's use of the term "relational purist", and preferred us to use the term "relational conformist". I demur. I think Clifford's term is somewhat more accurate.    The reason I say this is that I cannot get my head around the idea that E.F. Codd was not a "relational ...
    Posted to ORM Techniques (Forum) by Andy Carver on 05-23-2011
  • Re: To Null or not to Null. That is the question!

    Hi Mr. Darwen, Although my wad is shot, I do notice I omitted to respond to a few questions and comments from you. Please allow me to do so below, in-line like >> this.  [quote user="hughdarwen"] <snip>  Here I just want to respond further to this, from you: "The reason why nulls are GOOD is ...
    Posted to ORM Techniques (Forum) by Andy Carver on 05-23-2011
  • Re: Modeling based an existence chain

    Hi Ken, Excellent proposal. I would be glad to comment on your model.    From what I can tell, the domain (or to be precise, Marc's "watered-down version" of it) involves the idea that a person works for a federal agency or a Public Organization (or has no documented work), but does not do both. In ...
    Posted to ORM Techniques (Forum) by Andy Carver on 05-22-2011
  • Re: To Null or not to Null. That is the question!

    [quote user="hughdarwen"]performance is a characteristic of the implementation, not the language[/quote] While it's all very well to claim that, real applications must be written with real DBMS. [quote user="hughdarwen"]some queries of course go faster after decomposition[/quote] Of course, and the column store ...
    Posted to ORM Techniques (Forum) by Anonymous on 05-22-2011
  • Re: Modeling based an existence chain

    Ken, I thought that Andy's request was quite reasonable. To justify that, I will return to your claims: Isn't it the case that relational theory breaks down when missing values (nulls) are encountered in a table? In Marc's case, (see my amended version of Andy's model below), the Claimant's FederalAgency and ...
    Posted to ORM Techniques (Forum) by Anonymous on 05-22-2011
  • Re: Modeling based an existence chain

    Hi Andy, May I suggest that we begin with you commenting on my earlier proposal - which you can see if you scoll back up the thread a few posts. Ken
    Posted to ORM Techniques (Forum) by Ken Evans on 05-22-2011
  • Re: To Null or not to Null. That is the question!

    Clifford wrote: "The problem with SQL is that for the implementations to get reasonable performance, facts should be clustered into tables that represent composite facts wherever that's possible." That point about performance is frequently made.  I always want to remark that performance is a characteristic of the ...
    Posted to ORM Techniques (Forum) by hughdarwen on 05-22-2011
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