OTOMH (I didn't go through your code), are the two databases the same? If not, this is possibly related to database specific compiling (or the lack of) and a common error. Note the `bind` references in the docs: http://docs.sqlalchemy.org/en/latest/core/tutorial.html#executing Depending on how you invoke a select, the statement will either be compiled as a generic string or sqlalchemy knows that it should be customized for the specific database. Depending on the database, the generic version will or will not work. This might not be happening -- I didn't go through your code -- but many situations of "It works when I ___ but not when I ____" are related to this.
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