Mikhail, Thank you very much. This seems to have worked perfectly.
On 6/8/10 1:58 PM, "Mikhail V. Puzanov" <misha.puza...@gmail.com> wrote: > Hi, > > Something very straightforward looks like this, I guess: > > select * from users u > where ( > select count(*) from users u1 > where u1.username = u.username > and u1.signedup> u.signedup > )< 5 > > to get recent results. Or "u1.signedup< u.signedup" > for the first ones. But that doesn't work in case of > non-unique values in the signedup field. > > >> Greetings, >> >> Any help on this would be appreciated. >> >> 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. >> >> >> > -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
