Finding Duplicates In Two Different Objects

Hi

Is there a way of finding duplicate field entries in a table and a query: e.g.

In the Sickness Query (which contains, say 10 fields), in the Section field, it says "Benefits", and in the Week Commening field, it says "15/10/06"

And then

In the Nil Return Table (which only contains the Section & Week commencing fields), they also say "Benefits" and "15/10/06"

If there is a way of finding them, how do I delete the entry that has been made in the Nil return table?

Thanks

Maria