I currently have a query that returns the values of three expressions like this.

from Function f, Variable v, string s, string l
where 
foo
select f, s, l

The problem that I come across is that for each function f there are multiple values of l. For example, the output would be
printf, foo, lemon
printf, foo, straw

How could I write the query in such a way that it only chooses the first value of l. In this case, it would be lemon.