> > Above statements should result in query like: 'select a,count(a) from > > x where b=5,c=6 group by a' > > > > In order to get ORM object I need to use query. (That is what I get > > from reading the sentence I quoted) > > From the above, what ORM object would you like ? the one which has > "a" as one of its columns ? if so, the recipe I gave you is the > correct approach. > > > > What you emailed below is making a join if I read it correctly, and I > > don't think that is what I want. > >> sess.query(th).select_from(th_table.join(s, > >> th.RECORD_NO==s.c.RECORD_NO)).add_column(s.c.count).all() > >> > > > > > if you want to select a full row from the table, including its primary > key, and you'd like that row to correspond to a particular aggregate > query which needs to GROUP BY only part of the columns which does not > include the primary key column, you must use a join or subquery to > create the aggregate. > > To illustrate, this is the query you think you want: > > select *, count(a) from table group by a > > Why "*" ? because you say that you want "ORM objects". The ORM > object represents the *full* row, including the primary key, of the > table.
It makes sense now. I assumed that ORM object will only return 1 column I group by, and a count. When it returns the full row then my group_by makes no sense. Thanks Lucas ps. The links were really helpful ! > > but again, that query is invalid SQL. Most SQL-compliant databases > will raise an error. Another article explaining this: > http://weblogs.sqlteam.com/jeffs/jeffs/archive/2007/07/20/60261.aspx > . > > Therefore, the join or subquery is necessary if you wish to GROUP BY > only particular columns. > > > > > -- Automotive Recall Database. Cars, Trucks, etc. http://www.lucasmanual.com/recall/ Install Broadcom wireless card on Linux: http://lucasmanual.com/mywiki/bcm43xx --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
