Ah, I didn't notice this part of your query: .filter(..., Partsupp.ps_supplycost == session.query(func.min(Partsupp.ps_supplycost)))
I'm not sure exactly what SQL you are aiming for there, but I think you need to add .correlate (or maybe .correlate_except) to that inner query. Simon On Wed, Apr 18, 2018 at 5:24 PM, su-sa <sachdeva.sugandh...@gmail.com> wrote: > > Hi Simon, > > I am executing q2 on its own, may be I shouldnt have mentioned correlate, > but if I dont mention it I get another error: > > sqlalchemy.exc.InvalidRequestError: Select statement 'SELECT > min(partsupp.ps_supplycost) AS min_1 > FROM partsupp, part, supplier, nation, region > WHERE part.p_partkey = partsupp.ps_partkey AND supplier.s_suppkey = > partsupp.ps_suppkey AND supplier.s_nationkey = nation.n_nationkey AND > nation.n_regionkey = region.r_regionkey AND region.r_name = ?' returned no > FROM clauses due to auto-correlation; specify correlate(<tables>) to control > correlation manually. > > I am not sure how I should go about it. > > Thanks for your help, > > Greetings, > Sugandha > > On Wednesday, 18 April 2018 17:27:36 UTC+2, Simon King wrote: >> >> Are you executing q2 on it's own, or nested in a larger query? If so, >> can you show the code for the larger query. >> >> I ask because you are calling ".correlate(Partsupp, Supplier, Nation, >> Region)", which I think has the effect of removing those tables from >> the FROM clause, in the assumption that they are part of the outer >> query. >> >> Simon >> >> > -- > SQLAlchemy - > The Python SQL Toolkit and Object Relational Mapper > > http://www.sqlalchemy.org/ > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. See http://stackoverflow.com/help/mcve for a full > description. > --- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at https://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
