Hello. I think you want this:
http://docs.sqlalchemy.org/en/rel_0_7/core/expression_api.html#sqlalchemy.sql.expression.literal_column Basic usage example: from sqlalchemy.sql.expression import literal_column # Connect... print Session.query(literal_column('42')) # prints: 'SELECT 42' HTH, Ladislav Lenart On 20.3.2013 18:39, Alexey Vihorev wrote: > Hi! > > I’ve got to unite two tables preserving some of their columns as distinct, so > to comply with the “same number, same type” requirement of the UNION operator > I > use placeholder values, like this: > > > > *SELECT*united.customer_id, > > united.document_id, > > *SUM*(united.debt_moved) *AS*debt_moved, > > *SUM*(united.debt_total) *AS*debt_total, > > *SUM*(debt_total -debt_moved) *AS*delta > > *FROM* > > (*SELECT*debt.customer_id, > > debt.document_id, > > debt.debt *AS*debt_total, > > 0.00*AS*debt_moved /--placeholder value/ > > > > *FROM*debt > > *UNION**ALL**SELECT*debt_movement.customer_id, > > debt_movement.document_id, > > debt_movement.debt *AS*debt_moved, > > 0.00*AS*debt_total /-- placeholder value/ > > > > *FROM*debt_movement > > *WHERE*debt_movement.date_time>'04/03/2013') *AS*united > > *GROUP**BY*customer_id, > > document_id > > > > But I found no obvious way to do that in SA. Any thoughts? Thanks! -- 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 http://groups.google.com/group/sqlalchemy?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
