× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



+1 John

And any UDF is a call from the DB layer, and calculations can easily cause full table scans. It all depends.

Vern

On 1/28/2015 12:01 PM, John Yeung wrote:
On Wed, Jan 28, 2015 at 12:36 PM, Peter Dow <petercdow@xxxxxxxxx> wrote:
"could be very fast - no calcs" sounds odd to me. Are date calculations
really slower than disk access?
I think the big benefit, performance-wise as well as code-wise, is
when you need to process lots of dates "in one go". You could have a
situation where you would need to repeat the same set of date
calculations for millions of records, and you need the results of
those calculations just to even DO a join or filter. What a date
table does is, essentially, precalculate everything, at the cost of
one extra join. It's a very scalable approach.

John Y.


As an Amazon Associate we earn from qualifying purchases.

This thread ...

Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.