hi Christian, I also just got this error message when testing a migration from sqlite to postgres. Thanks for the diagnosis of the problem. Have you found a work around yet using the DAL? Richard
On Aug 10, 4:56 pm, howesc <how...@umich.edu> wrote: > This is in Postgres. > > I did a little digging, and apparently mixing the JOIN syntax is a > problem. So if i re-write thequeryin this fashion it works: > > SELECT c.name, c.id, cp.date, a.name, v.name, c.date, af.file > FROM venue v > JOIN concert c ON c.venue=v.id > JOIN concert_purchases cp ON cp.concert=c.id > JOIN artist a ON a.id=c.artist > LEFT JOIN audiofile af ON af.concert=c.id > WHERE cp.auth_user=3 > AND c.id=cp.concert > AND cp.expires>'2009-08-08 09:46:23' > ORDER BY cp.date DESC; > > some others have suggested that mixing the join syntax has operator > precedence issues, and that Postgres follows the standard while other > databases let you get away with the "incorrect" > syntax:http://archives.postgresql.org/pgsql-general/2006-09/msg01046.phphttp://stackoverflow.com/questions/187146/inner-join-outer-join-is-th... > > based on their analysis a standard compliant SQL parser will interpret > the web2py generatedquerylike this: > SELECT concert.name, concert.id, concert_purchases.date, artist.name, > venue.name, concert.date, audiofile.file FROM venue, concert, > concert_purchases, (artist LEFT JOIN audiofile ON > audiofile.concert=concert.id) WHERE ((((concert_purchases.auth_user=3 > AND concert.id=concert_purchases.concert) AND > concert_purchases.expires>'2009-08-08 09:46:23') AND > artist.id=concert.artist) AND venue.id=concert.venue) ORDER BY > concert_purchases.date DESC; > > note the added parens around the last item in the from clause and the > LEFT JOIN item - hence concert is not visible. if i re-write it > knowing the operator precedence like this: > > SELECT concert.name, concert.id, concert_purchases.date, artist.name, > venue.name, concert.date, audiofile.file > FROM venue, artist, > concert_purchases, concert LEFT JOIN audiofile ON > audiofile.concert=concert.id WHERE ((((concert_purchases.auth_user=3 > AND concert.id=concert_purchases.concert) AND > concert_purchases.expires>'2009-08-08 09:46:23') AND > artist.id=concert.artist) AND venue.id=concert.venue) ORDER BY > concert_purchases.date DESC; > > it also works...which explains to me why some of my left joins work > and some don't - if i'm lucky and the lasttablein the from clause is > what i am left joining on it works. > > that being said, it looks like i'm the only one with that problem so i > don't expect you to try and fix that right away. > > thanks, > > Christian > > On Aug 8, 4:17 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > Is this sqlite? The generated SQL looks right to me. Do you see > > anything wrong with it? > > > On Aug 8, 11:48 am, howesc <how...@umich.edu> wrote: > > > > Massimo, > > > > I downloaded the latest released version today: Version 1.65.11 > > > (2009-08-04 16:42:46), and it still fails. here is the generated SQL: > > > > SELECT concert.name, concert.id, concert_purchases.date, artist.name, > > > venue.name, concert.date, audiofile.file FROM venue, concert, > > > concert_purchases, artist LEFT JOIN audiofile ON > > > audiofile.concert=concert.id WHERE ((((concert_purchases.auth_user=3 > > > AND concert.id=concert_purchases.concert) AND > > > concert_purchases.expires>'2009-08-08 09:46:23') AND > > > artist.id=concert.artist) AND venue.id=concert.venue) ORDER BY > > > concert_purchases.date DESC; > > > > Thanks, > > > > Christian > > > > On Aug 6, 11:58 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > > > Please try a new version of web2py (I remember addressing a bug about > > > > this in the past). if you still have a problem, try print the _select > > > > and let us see the generate sql. This should definitively be possible. > > > > > Massimo > > > > > On Aug 6, 6:15 pm, howesc <how...@umich.edu> wrote: > > > > > > Hi all, > > > > > > I'm writing several queries with multiple tables, and left joins, and > > > > > the generated SQL is not working with postgres: > > > > > > ProgrammingError: invalid reference to FROM-clauseentryfortable > > > > > "concert" > > > > > LINE 1: ..., artist LEFT JOIN audiofile ON > > > > > audiofile.concert=concert.id... > > > > > ^ > > > > > HINT: Thereis anentryfortable"concert",butitcannotbe > > > > >referencedfrom thispartof thequery. > > > > > > myqueryis: > > > > > query= db((db.concert_purchases.auth_user == auth.user.id) & > > > > > (db.concert.id == db.concert_purchases.concert) & > > > > > (db.concert_purchases.expires > now) & > > > > > (db.artist.id == db.concert.artist) & > > > > > (db.venue.id == db.concert.venue)) > > > > > rows =query.select(db.concert.name, db.concert.id, > > > > > db.concert_purchases.date, > > > > > db.artist.name, > > > > > db.venue.name, > > > > > db.concert.date, > > > > > db.audiofile.file, > > > > > left=db.audiofile.on(db.audiofile.concert == > > > > > db.concert.id), > > > > > orderby=~db.concert_purchases.date) > > > > > > I have web2py Version 1.63.5 (2009-06-03 23:35:00) > > > > > > so, istherea way i can write thequeryto make the left join work, > > > > > or should i just do multiple queries? > > > > > > thanks for the help, > > > > > > christian --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "web2py-users" group. 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