There are two tables pump and curve. The curve table has three fields, curve_pn, head and gpm. The design is that the rows with the same curve_pn value represent x,y points (head,gpm) on a pump performance curve. Each row in the pump table has a curve_pn column that links to the performance curve for that pump. The same performance curve can apply to multiple pumps.
To me it seems that there is a many-many relationship, yet there is no association table. This design works fine in straight SQL. To model it in SQLAlchemy, do I need to add an association table? For the purposes of this application, the data is read-only, but if it were not, if the data for a curve were to change, I would want it to change for all the pumps that use that curve_pn. TIA, Mark -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
