I've a question about using sqlSave. How maps RODBC data in the data frame to the database table columns?

If I've a table with columns X and Y and a data frame with columns X and Y, RODBC puts X into X and Y into Y (I found out by trail-and-error). But can I explicitly tell R how to map data.frame columns to database table columns, like put A in X and B in Y.

I'm rather new to R and think the RODBC manual is a bit cryptic. Nor can I find an example on the internet.