Can I read in an external sql file and use this in a query

Hello,

I would like to use an external text file as the source for a database query to be executed.

Background:

I would like to develop, test, etc. my sql scripts in a dedicated tool (eg. Toad) and then save that SQL file to a certain disk location so it can be used in a Knime workflow. Reason that I don't want to copy/paste it into the workflow is that some customer selections are made in this sql script and this script is also used by other people/scripts. 

I am afraid to have multiple versions of the customer selection script flying around...

Regards,

Geoffrey