On 8 June 2010 17:29, Aaron Burnett <aburnett@xxxxxxxxxxxx> wrote: > > Greetings, > > I hope this is the proper list for this, but I am a loss on how to achieve > one particular set of results. > > I have a table which is a list of users who entered a contest. They can > enter as many times as they want, but only 5 will count. So some users have > one entry, some have as many as 15. > > How could I distill this down further to give me a list that shows each > entry per user up to five entries per user? In other words, I need a > separate line item for each entry from each user up to the maximum of 5 rows > per user. > > Table looks like this: > username | firstname | lastname | signedup > --------------------------------------+-----------+-------------+----------- > - > ffc4bd0a-ccff-4203-a03c-4bd6b8c23a03 | Jean | Mathews | 2010-03-13 > ffc4bd0a-ccff-4203-a03c-4bd6b8c23a03 | Jean | Mathews | 2010-05-07 > ffc4bd0a-ccff-4203-a03c-4bd6b8c23a03 | Jean | Mathews | 2010-06-06 > ff8720d4-f808-4ee6-90e6-649872fdfa55 | Janis | Bunch | 2010-03-12 > ff48d89b-6afe-4ba0-8539-9683bec62c89 | Sandy | Yashnyk | 2010-04-25 > ff48d2a4-0637-4e46-9461-3dd0dc0d4d83 | Kendra | Elliott | 2010-05-09 > ff3a2a14-2575-44d5-b40b-3780f4d2506a | Kay | Maher | 2010-04-20 > fef7625b-d1e1-4c1a-bc82-d35a4a6db16d | Carolyn | Woodul | 2010-04-05 > fef21bbb-07a0-4c84-8708-4dc41b8b770b | Laurie | Montijo | 2010-04-03 > feee6473-af4d-4e70-b20c-a74ba08c000f | Geneva | Anderson | 2010-04-03 > feb690fc-0afb-4e87-b0d1-bdb2c4603fd1 | Judith | Astroff | 2010-06-05 > fea0f9a6-e89f-4dbd-b3fd-83efed27221f | Jennifer | Lavigne | 2010-02-09 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-03-20 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-03-27 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-04-03 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-04-10 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-04-17 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-04-25 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-05-01 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-05-08 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-05-16 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-05-22 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-05-30 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-06-06 > fe825a6d-6820-4282-b8e9-2e3cb9f660e8 | Susan | Stowe | 2010-03-12 > fe825a6d-6820-4282-b8e9-2e3cb9f660e8 | Susan | Stowe | 2010-03-15 > > But in John Smith's case where he has more than 5 entries, I would like > query results to limit him to just 5 entries to look like this: > > username | firstname | lastname | signedup > --------------------------------------+-----------+-------------+----------- > - > ffc4bd0a-ccff-4203-a03c-4bd6b8c23a03 | Jean | Mathews | 2010-03-13 > ffc4bd0a-ccff-4203-a03c-4bd6b8c23a03 | Jean | Mathews | 2010-05-07 > ffc4bd0a-ccff-4203-a03c-4bd6b8c23a03 | Jean | Mathews | 2010-06-06 > ff8720d4-f808-4ee6-90e6-649872fdfa55 | Janis | Bunch | 2010-03-12 > ff48d89b-6afe-4ba0-8539-9683bec62c89 | Sandy | Yashnyk | 2010-04-25 > ff48d2a4-0637-4e46-9461-3dd0dc0d4d83 | Kendra | Elliott | 2010-05-09 > ff3a2a14-2575-44d5-b40b-3780f4d2506a | Kay | Maher | 2010-04-20 > fef7625b-d1e1-4c1a-bc82-d35a4a6db16d | Carolyn | Woodul | 2010-04-05 > fef21bbb-07a0-4c84-8708-4dc41b8b770b | Laurie | Montijo | 2010-04-03 > feee6473-af4d-4e70-b20c-a74ba08c000f | Geneva | Anderson | 2010-04-03 > feb690fc-0afb-4e87-b0d1-bdb2c4603fd1 | Judith | Astroff | 2010-06-05 > fea0f9a6-e89f-4dbd-b3fd-83efed27221f | Jennifer | Lavigne | 2010-02-09 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-03-20 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-03-27 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-04-03 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-04-10 > fea0334e-4ae1-4599-b24d-9a5d8ce4fd37 | John | Smith | 2010-04-17 > fe825a6d-6820-4282-b8e9-2e3cb9f660e8 | Susan | Stowe | 2010-03-12 > fe825a6d-6820-4282-b8e9-2e3cb9f660e8 | Susan | Stowe | 2010-03-15 > > The username is unique for each user. > > pg version 8.25 on RHEL > > Any help in this would be greatly appreciated. > > Thank you. > Bit crude, but if you have an id column, try: SELECT username, firstname, lastname, signedup FROM entries WHERE id IN (SELECT id FROM entries limitedentries WHERE limitedentries.username = entries.username ORDER BY signedup limit 5) ORDER BY username, signedup Regards Thom -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
