Hi all.
This is not very "hackers"-related, but related to the topic of window-funcitons, which seems to be discussed quite a
biton "hackers" these days.
Can window-functions in PG be used to return "total number of rows" in a "paged result"?
Say you have:
SELECT p.id, p.firstname FROM person pORDER BY p.firstname ASCLIMIT 10 OFFSET 10
Is it possible to use some window-function to return the "total-number of columns" in a separate column?
In Oracle one can do
SELECT q.*, max(rownum) over() as total_rows FROM (subquery)
which returns the total number or columns in a separate column. This is very handy for web-pages which for example need
todisplay the rist 20 results of several million, without having to do a separate count(*) query.
--
Andreas Joseph Krogh <andreak@officenet.no>
Senior Software Developer / CEO
------------------------+---------------------------------------------+
OfficeNet AS | The most difficult thing in the world is to |
Karenslyst Allé 11 | know how to do a thing and to watch |
PO. Box 529 Skøyen | somebody else doing it wrong, without |
0214 Oslo | comment. |
NORWAY | |
Tlf: +47 24 15 38 90 | |
Fax: +47 24 15 38 91 | |
Mobile: +47 909 56 963 | |
------------------------+---------------------------------------------+