Re: [sqlalchemy] Re: unable to do nested select while using query object

@Mike, Jonathan and Simon - Thank you so much for all your efforts. I hope I can fix the problem soon in the dialect :-) P.s. I have finally been able to generate the correct query, but now currently the problem is that I get no result, although the query is absolutely correct and should give

Re: [sqlalchemy] Re: unable to do nested select while using query object

Dialects can completely affect the generation of SQL strings and the odd pattern of FILTER (WHERE ... ) shown in your output suggests this is the case as SQLAlchemy does not generate any such content ; there is no "FILTER" keyword in SQLAlchemy. On Wed, Apr 18, 2018, 11:20 AM su-sa

Re: [sqlalchemy] Re: unable to do nested select while using query object

Hi, Thanks for your time, probably you are all right. Greetings, Sugandha -- 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

Re: [sqlalchemy] Re: unable to do nested select while using query object

Hi, Thanks a lot for your time, I have been work on and with that dialect for sometime, but probably you are all correct. Greetings, Sugandha -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE:

Re: [sqlalchemy] Re: unable to do nested select while using query object

On Wednesday, April 18, 2018 at 11:20:39 AM UTC-4, su-sa wrote: > > > But if I am not mistaken, the from clause of the query is generated by > SQLAlchemy and the database driver or the dialect has no influence on this > from clause generation of SQLAlchemy. > As an aside from everything

Re: [sqlalchemy] Re: unable to do nested select while using query object

q2 = session.query(Supplier.s_acctbal, Supplier.s_name, Nation.n_name, Part.p_partkey, Part.p_mfgr, Supplier.s_address, Supplier.s_phone, Supplier.s_comment).filter(Part.p_partkey == Partsupp.ps_partkey, Supplier.s_suppkey== Partsupp.ps_suppkey,

Re: [sqlalchemy] Re: unable to do nested select while using query object

I am not sure what you mean exactly, am I applying the .correlate at the wrong place ? Thats the query I am trying to reproduce. select top 100 s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address, s_phone, s_comment from sf10.c_part, sf10.c_supplier,

Re: [sqlalchemy] Re: unable to do nested select while using query object

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,

Re: [sqlalchemy] Re: unable to do nested select while using query object

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

Re: [sqlalchemy] Re: unable to do nested select while using query object

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

Re: [sqlalchemy] Re: unable to do nested select while using query object

But if I am not mistaken, the from clause of the query is generated by SQLAlchemy and the database driver or the dialect has no influence on this from clause generation of SQLAlchemy. And as you can see, the wrong from clause in generated in the subquery: AS min_1 \nFROM part \nWHERE

Re: [sqlalchemy] Re: unable to do nested select while using query object

unfortunately this issue is related to that database /drivers so you'd need to get support from those folks. On Wed, Apr 18, 2018 at 10:37 AM, su-sa wrote: > Hi Mike, > > 'hdbcli' is the official python driver for SAP HANA and you are right that > it is not

Re: [sqlalchemy] Re: unable to do nested select while using query object

Hi Mike, 'hdbcli' is the official python driver for SAP HANA and you are right that it is not open-source. I also tried with pyhdb: q2 = session.query(Supplier.s_acctbal, Supplier.s_name, Nation.n_name, Part.p_partkey, Part.p_mfgr, Supplier.s_address, Supplier.s_phone,

Re: [sqlalchemy] Re: unable to do nested select while using query object

Hi Mike, 'hdbcli' is the official python driver and you are right that it is not open-source. I also tried with pyhdb: q2 = session.query(Supplier.s_acctbal, Supplier.s_name, Nation.n_name, Part.p_partkey, Part.p_mfgr, Supplier.s_address, Supplier.s_phone,

Re: [sqlalchemy] Re: unable to do nested select while using query object

On Wednesday, 18 April 2018 15:50:10 UTC+2, Mike Bayer wrote: > > what the heck is FILTER?I am googling for "hdbcli" and not getting > a clear signal back, it's not even on pypi, seems to be related to SAP > but I can find no source links or anything (there seems to be a > competing

Re: [sqlalchemy] Re: unable to do nested select while using query object

what the heck is FILTER?I am googling for "hdbcli" and not getting a clear signal back, it's not even on pypi, seems to be related to SAP but I can find no source links or anything (there seems to be a competing driver PyHDB that is more open source friendly).This would be an issue with

[sqlalchemy] Re: unable to do nested select while using query object

On Wednesday, 18 April 2018 12:18:51 UTC+2, su-sa wrote: > > > > Hi everyone, > > I've been trying quite a while to reproduce the following query:q2 = text( > "select top 100 s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address, > s_phone, s_comment from system.part, " >

[sqlalchemy] unable to do nested select while using query object

Hi everyone, I've been trying quite a while to reproduce the following query:q2 = text( "select top 100 s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address, s_phone, s_comment from system.part, " "system.supplier, system.partsupp, system.nation, system.region where p_partkey =

[sqlalchemy] Re: Is there any way do select top 100 results from a query in SQLAlchemy?

On Tuesday, 17 April 2018 23:59:25 UTC+2, Jonathan Vanasco wrote: > > > > On Tuesday, April 17, 2018 at 5:58:32 PM UTC-4, Jonathan Vanasco wrote: >> >> >> So .limit() is .top() >> > > Clarified: `limit()` is essentially the same as if there were a `top()`, > because it will emit `TOP` for the