Subtraction between two sql queries

Question

I have 2 queries in MS SQL that return a number of results using the COUNT function.

I can run the the first query and get the first result and then run the other on

Answer 1

You should be able to use subqueries for that:

SELECT
    (SELECT COUNT(*) FROM ... WHERE ...)
  - (SELECT COUNT(*) FROM ... WHERE ...) AS Difference

Just tested it:

Difference
-----------
45

(1 row(s) affected)