What's the difference between a "nested/sub query" and an "additional query"?
Nested queries allow you to do something like:
(this or that) and the other
In the above, “that” would be a nested query, and you would get results that match either “this” or “that”. That combined result set is then restricted by things matching “the other”.
If instead you search on this or that and the other, the results will be unreliable because “or that” will not be restricted by "the other".
For this reason, we recommend using nested queries when you want to evaluate results together, in combination with another query. Common examples include:
Anyone who donated last year
Anyone who is a current parent
Anyone who has donated this year.
In the above example, “Anyone who is a current parent” should be nested.