On Fri, Dec 19, 2008 at 3:09 PM, Sean DiZazzo <[email protected]> wrote: > > Thakns for the link. I'll give it a go. For some reason, the posts I > found led me to believe that there was no inner join function. > >> wow really my time machine should be broken. Because I haven't get to >> that point in time yet. I'm still stuck as far away as TG2 release >> party. > > oh yeah...I meant TG2. I promise to upgrade when the TG2 book comes > out!! > did you heard that Mark, how is that coming along? :)
> Would this be easier with sqalchemy?? > oh yes SA has this very nice low layer api at the package sqlalchemy.sql, which lets you work almost at the dbapi level but with nice python-like constructs and it fairly documented http://www.sqlalchemy.org/docs/05/sqlexpression.html#selecting > On Dec 19, 12:52 pm, "Jorge Vargas" <[email protected]> wrote: >> On Fri, Dec 19, 2008 at 12:39 PM, Sean DiZazzo <[email protected]> >> wrote: >> >> > oops...record 3 filename should be foo.txt (matching the first >> > record) The filenames for records 1& 3 match, so the query should >> > only return records 1 & 2... 1 is more recent date than 3 >> >> ok so the table has duplicated records that really represent older >> versions of the same file. and what you need is the newest of each >> file for all files, right? >> >> > I found this sql, but it is untested ( un-understood too ): >> >> > I guess I should add the "order by date desc" as well... >> >> > """SELECT files.* FROM files INNER JOIN (SELECT MAX(id) AS id FROM >> > files GROUP BY filename) ids ON files.id = ids.id""" >> >> > Last time I tried TurboGears 3 it was not ready for me... Plus, I'll >> > need to dedicate some time to learn how SQAlchemy works, and I don't >> > really have the time to dedicate at the moment. >> >> wow really my time machine should be broken. Because I haven't get to >> that point in time yet. I'm still stuck as far away as TG2 release >> party. >> >> You don't need tg2, SA is default since TG1.1, where the api change is >> minimal (SO->SA, kid->genshi) >> >> > I found documentation for SQLobject on left join, max and group, but >> > nothing for inner join. And since I can't even decipher it, I can't >> > try to change the sql to work without having an sql inner join. >> >> how about >> thishttp://www.sqlobject.org/SQLObject.html#left-join-and-other-joins >> it explain how to use left join but it's analogous to the other joins >> which are listed at the bottom of the section INNERJOIN is the name of >> your function. >> >> > ~Sean >> >> > On Dec 19, 4:53 am, "Jorge Vargas" <[email protected]> wrote: >> >> On Fri, Dec 19, 2008 at 12:12 AM, Sean DiZazzo <[email protected]> >> >> wrote: >> >> >> > Hi group, >> >> >> > I'm a MySQL and Turbogears novice. Looking for some help in setting >> >> > up a database query. I'm trying to query a table by a specific field >> >> > (not unique), but only have the database return the most recent record >> >> > of any duplicate record. >> >> >> > For example: >> >> >> > Files >> >> > -------------------------------------- >> >> > id | filename | date | >> >> > -------------------------------------- >> >> > 1 foo.txt 12_07_2008 >> >> > 2 poo.txt 12_01_2008 >> >> > 3 foo.text 12_06_2008 >> >> >> > I'd like to query the db so the resulting SearchResults object only >> >> > contains records 1 & 2. >> >> >> sorry but your text doesn't match the example how are records 1 and 2 >> >> duplicated? Do you have the raw SQL of what you want to accomplish? >> >> >> On a related note, unless you have a bug code base already build on >> >> SO, I strongly suggest you start your migration towards SQLAlchemy, >> >> for many reasons you can search the group for including that overthere >> >> this is death simple. >> >> >> > I found some complex sql queries using inner joins, but couldn't >> >> > figure out how to use them with sqlobject. I also tried to filter the >> >> > results of a full query, but came to dead ends. >> >> >> > files = model.Files.select(???) >> >> >> > Any help would be appreciated! >> >> >> > ~Sean > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "TurboGears" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/turbogears?hl=en -~----------~----~----~----~------~----~------~--~---
