|Do you know where your variables are?|
Re: Re: Re: Re: Choosing a data structure for AI applicationsby Ovid (Cardinal)
|on Jul 16, 2002 at 16:25 UTC||Need Help??|
Here's a very simple example that I pulled from http://www.csm.astate.edu/~rossa/cs3543/plect5.html.
Let's say that I want to find all X that is on Y that, in turn, is on Z. I would issue the following query:
Here's how the backtracking works.
This is a trivial example (and I took some shortcuts - see the actual link above), but imagine what happens why we have facts embedded in facts and we need to gain information from those subfacts:
Now, if I issue queries against that (and we're in a proper SQL database), I have at least three tables that I need to span and potentially backtrack across. If my query is more complicated, the number of tables can rise dramatically.
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