Hi Simon Thanks for your help. It's amazing what a tiny hint in the right direction can do.. Between these emails, I've made a proof on concept, and am now implementing the code in the real app. So easy when I'm not blocked by a warped vision of what I'm doing.
Funny, looking back at the docs I can now clearly see TABLE.join.... T A B L E.join, not query.join... I'm SURE that wasn't there before.... ;-D Thanks again. Cheers Warwick On 5 October 2010 20:39, King Simon-NFHD78 <simon.k...@motorola.com> wrote: > Warwick Prince wrote: > > > > Hi Simon > > > > Thanks for that - I knew it was something wrong with the approach but > > simply could not pick it! Back to the test bench for another go :-) > > > > Cheers > > Warwick > > > > P.S. OK - I have to ask - when and how (why?) do I do the .join on > > the query? ;-) > > > > In SQL, you can treat a query just like a table, so you can join 2 > queries together, or join a query to another table. For example: > > SELECT * > FROM > (SELECT a, b FROM table_1) as q1 > INNER JOIN > (SELECT c, d FROM table_2) as q2 > ON q1.b = q2.c > > That example is not very helpful - it could easily be rewritten as a > single SELECT, but I hope you see that the subqueries can be as > complicated as you like. > > The object that you were originally producing with your 'q.join(price)' > wasn't a Select object, but a Join - something that you can select from. > You could write something like this: > > # JOIN the price table with a query on the products table: > j = prod.select().join(price) > > # SELECT from that JOIN: > q = select(<some_columns>, from_obj=[j]) > > This almost certainly isn't what you wanted in your situation, but there > are plenty of cases where subqueries are very useful. > > Hope that helps, > > Simon > > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To post to this group, send email to sqlalch...@googlegroups.com. > To unsubscribe from this group, send email to > sqlalchemy+unsubscr...@googlegroups.com<sqlalchemy%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/sqlalchemy?hl=en. > > -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
