Ron Mayer <rm_pg@cheapcomplexdevices.com> wrote:
> David Fetter wrote:
>>> the terse mathematical notation commonly used...
>> Again, if you have a piece of software you can point to that does
>> this
>> thing, please do so.
>
> I seriously doubt it follows Date or Pascal religiously, but
> it does have a convenient and very terse mathematical notation
> so might count as a real-world piece of software that you were
> asking for.
>
> [1] http://www.kx.com/news/press-releases/arthur-interview.php
> [2] http://www.kx.com/news/in-the-news/sql-timeseries.php
> [3] http://www.intelligententerprise.com/010327/celko_online.jhtml;jsessionid=NDIHEWXGL4TNKQSNDBNSKHSCJUMEKJVN
> [4] http://www.cs.nyu.edu/courses/fall02/G22.3033-007/kintro.html
The sample problem in [3] is one that shows pretty nicely a
significant SQL weakness; it's very painful to build SQL to do complex
things surrounding cumulative statistics.
Unfortunately, across that set of URLs, I don't actually see a single
presentation of their terse notation for handling time series, so it's
not quite an answer, either.
I should probably try to take another look at Tutorial D to see if it
actually *does* provide something that would help make aggregates
"play better." I'm not certain it tries nearly hard enough...
I'm not sure what the Right Answer would be. I'm not certain there
necessarily is one, short of either programming using vector
statements (ala K) or lambda expressions (Lisp), neither of which are
likely to be considered "generally acceptable." I'd rather see some
attempts at it than the "head in sand" of present...
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