id like to move to github completely and I wish bitbucket had a way to turn off pull requests (they don't). So please use github pull requests, thanks!
On Thu, Mar 8, 2018 at 9:45 AM, <nicolas.ro...@tiime.fr> wrote: > >> I'm not going to choose a random table like that. the DB needs to >> support running this kind of query correctly. This is just PG and >> MySQL. we have all the others to see how badly they screw this up >> also. > > > I naively thought that the statement 'SELECT 1 WHERE 1 != 1" would work on > any DB, but it seems it won't be the case as it is a syntax error on mariaDB > (and I guess on some other DB then). > > However any BD implementing IN predicate accepting a subquery as the list > must implement a coherent way to deal with empty list on IN (or at least > send a proper error message), as a subquery producting an empty result is a > perfectly valid query. > > So this "trick" might be adaptable to all DB (I didn't managed to find the > doc of IN for synbase and oracle so I can't tell for them). > Moreover sqlite, postgres, myqsl and mariaDB agree on the (NULL IN () == > False) question, so letting the DB create the empty list shouldn't lead too > much to a "SQLAlchemy is not abstracting differences between the > databases!!". > > The statement "SELECT 1 FROM ((SELECT 1) as placeholder_table) WHERE 1!=1;" > is more promising, as (sqlite, postgres, myqsl and mariaDB) all accept it, > and any DB that accept a select query as a valid table too (it looks like > Microsoft SQL server will accept it too, can't say for firebird, oracle or > sybase as I found niether a doc or a way to make it run). > > > What is the procedure to propose a PR (with tests obviously) ? Issues are > supposed to be in bitbucket, but most PR are on the github > > -- > Nicolas Rolin > > > -- > 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.
