PostgreSQL: How to return rows with respect to a found row (relative results)?

Question

Forgive my example if it does not make sense. I\'m going to try with a simplified one to encourage more participation.

Consider a table like the following:

Answer 1

You could use something like that:

select * from foo 
where dt between now()- interval '7 months' and now()+ interval '3 months'

This and this may help you.