two parameters from one query?

Hey PRD experts,

Is it possible to run a query on an external data source, and then query the resulting table multiple times to populate multiple parameters?

I have a query that returns two columns like the table at the bottom of this post. Using this query as a source, I would like to create a [day_param] that displays distinct values from the first column (e.g., SELECT DISTINCT day). And I would like to create a [mkt_param] that displays values from the second column based on the user's [day_param] selection (e.g., SELECT mkt WHERE day = [day_param]).

I am trying to avoid querying my external data source twice. Is this possible?

Thanks,
RR