Couple of questions...
"Aaron Freeman" <[email protected]> Tue, 20 Apr 2004 09:46:39 -0700
| Newsgroups | gmane.comp.python.modeling |
|---|---|
| Message-ID | <20040420164648.YGFQ15011.fed1rmmtao11.cox.net@halcyon> |
(1) Is there a debug flag somewhere that dump all SQL queries to the console? (2) How are nested joins accomplished? For example, in the AuthorBooks schema, lets assume there is another table called publisher that has a 1-M relationship with books, like so (sorry about the formatting): ............................................................................ ............. .+-----------+.(0,1)..............(0,*).+-------+.(0,*)..............(0,1).+ -----------+. .|..Writer...|<-author----------books->>|.Book..|<<-books-------publisher->| .Publisher.|. .|-----------|.(nullify)......(cascade).|-------|..........................| -----------|. .|.lastName..|..........................|.title.|..........................| .bizName...|. .|.firstName.|..........................|.price.|..........................| .location..|. .|.age.......|.(0,1)....................+-------+..........................+ -----------+. .|.birthday..|<-pygmalion--+................................................ ............. .+-----------+.(nullify)...|................................................ ............. .....|....................|................................................. ............ ......+--------------------+................................................ ............. ............................................................................ ............. How would I get writers by publisher? More specifically, is there an elegant way to do a nested join in a single query, or do I just have to do a single writer-book join and then iterate over the resultset for the second join? Code examples would be great! Thanks for your time. -Aaron ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click