On 03/02/2012 08:30, Chris Travers wrote:
On Fri, Feb 3, 2012 at 12:26 AM, garry
<garry@scholarpack.com> wrote:
I have a table which holds a user name and their results in exams. There can be multiple entries per user. I am trying to return the last entry for each user. I can get the last entry in the table using the order by/limit method but how would this be applied per user. My table definition is like the following:
gradeid serial primary key,
user text,
grade char(1),
entered timestamp,
Any help would be appreciated.
Regards
What about a combination of a common table expression and a windowing function? You ought to be able to order by your criteria and then pull where the rowcount in the window is 1.
Unfortunately I am using a version of postgres without the windowing functions, but that would have done the job.
Regards
Garry