Re: nearest match

Поиск
Список
Период
Сортировка
От Tomasz Myrta
Тема Re: nearest match
Дата
Msg-id 3E7047DE.5000306@klaster.net
обсуждение исходный текст
Ответ на nearest match  ("Ryan" <pgsql-sql@seahat.com>)
Список pgsql-sql
Ryan wrote:
> I'm doing some work with part diagrams and server-side image maps.
> I want to store single point coordinates (x,y) for reference numbers in a
> table looking like:
> 
> reference_number text,
> x int,
> y int
> 
> My question is:  How can I find the *nearest* match of some clicked on
> coordinates without specifying some arbitrary distance from the stored
> point?
> 
> The more I think about this the more I am realizing it is probally not
> that hard, I just can't seem to grasp the answer right now.
Can you say it in math logic? How to find, that some points are nearer 
then other without counting distance?

For image maps consider using geometric types like polygon. You need 
only one row for one area when using them.

Regards,
Tomasz Myrta



В списке pgsql-sql по дате отправления:

Предыдущее
От: Stephan Szabo
Дата:
Сообщение: Re: Function calling error in postgreSQL 7.3.1
Следующее
От: Christoph Haller
Дата:
Сообщение: Re: Using update statements in create function statements